diff --git a/src/gui/qgsmaplayerstylemanagerwidget.cpp b/src/gui/qgsmaplayerstylemanagerwidget.cpp
index a25d32a2b67..38c7bbcab85 100644
--- a/src/gui/qgsmaplayerstylemanagerwidget.cpp
+++ b/src/gui/qgsmaplayerstylemanagerwidget.cpp
@@ -185,6 +185,7 @@ void QgsMapLayerStyleManagerWidget::saveAsDefault()
     if ( layer->dataProvider()->isSaveAndLoadStyleToDatabaseSupported() )
     {
       QMessageBox askToUser;
+      askToUser.setWindowTitle( tr( "Save Style" ) );
       askToUser.setText( tr( "Save default style to: " ) );
       askToUser.setIcon( QMessageBox::Question );
       askToUser.addButton( tr( "Cancel" ), QMessageBox::RejectRole );
@@ -227,6 +228,7 @@ void QgsMapLayerStyleManagerWidget::loadDefault()
     if ( layer->dataProvider()->isSaveAndLoadStyleToDatabaseSupported() )
     {
       QMessageBox askToUser;
+      askToUser.setWindowTitle( tr( "Load Style" ) );
       askToUser.setText( tr( "Load default style from: " ) );
       askToUser.setIcon( QMessageBox::Question );
       askToUser.addButton( tr( "Cancel" ), QMessageBox::RejectRole );
diff --git a/src/gui/qgsnewauxiliaryfielddialog.cpp b/src/gui/qgsnewauxiliaryfielddialog.cpp
index d2c64083bb8..f0d1c4a00fa 100644
--- a/src/gui/qgsnewauxiliaryfielddialog.cpp
+++ b/src/gui/qgsnewauxiliaryfielddialog.cpp
@@ -79,14 +79,14 @@ void QgsNewAuxiliaryFieldDialog::accept()
   const int idx = mLayer->fields().lookupField( fieldName );
   if ( idx >= 0 )
   {
-    const QString title = tr( "Invalid name" );
-    const QString msg = tr( "Auxiliary field '%1' already exists" ).arg( fieldName );
+    const QString title = tr( "New Auxiliary Field" );
+    const QString msg = tr( "Invalid name. Auxiliary field '%1' already exists." ).arg( fieldName );
     QMessageBox::critical( this, title, msg, QMessageBox::Ok );
   }
   else if ( def.comment().isEmpty() )
   {
-    const QString title = tr( "Invalid name" );
-    const QString msg = tr( "Name is a mandatory parameter" );
+    const QString title = tr( "New Auxiliary Field" );
+    const QString msg = tr( "Name is a mandatory parameter." );
     QMessageBox::critical( this, title, msg, QMessageBox::Ok );
   }
   else
diff --git a/src/gui/qgsnewgeopackagelayerdialog.cpp b/src/gui/qgsnewgeopackagelayerdialog.cpp
index bd654964573..b81c8f66c90 100644
--- a/src/gui/qgsnewgeopackagelayerdialog.cpp
+++ b/src/gui/qgsnewgeopackagelayerdialog.cpp
@@ -198,7 +198,7 @@ void QgsNewGeoPackageLayerDialog::mAddAttributeButton_clicked()
     QString myName = mFieldNameEdit->text();
     if ( myName == mFeatureIdColumnEdit->text() )
     {
-      QMessageBox::critical( this, tr( "Invalid field name" ), tr( "The field cannot have the same name as the feature identifier" ) );
+      QMessageBox::critical( this, tr( "Add Field" ), tr( "The field cannot have the same name as the feature identifier." ) );
       return;
     }
 
@@ -259,8 +259,8 @@ bool QgsNewGeoPackageLayerDialog::apply()
       {
         QMessageBox msgBox;
         msgBox.setIcon( QMessageBox::Question );
-        msgBox.setWindowTitle( tr( "The File Already Exists." ) );
-        msgBox.setText( tr( "Do you want to overwrite the existing file with a new database or add a new layer to it?" ) );
+        msgBox.setWindowTitle( tr( "New GeoPackage Layer" ) );
+        msgBox.setText( tr( "The File already exists. Do you want to overwrite the existing file with a new database or add a new layer to it?" ) );
         QPushButton *overwriteButton = msgBox.addButton( tr( "Overwrite" ), QMessageBox::ActionRole );
         QPushButton *addNewLayerButton = msgBox.addButton( tr( "Add new layer" ), QMessageBox::ActionRole );
         msgBox.setStandardButtons( QMessageBox::Cancel );
@@ -311,8 +311,8 @@ bool QgsNewGeoPackageLayerDialog::apply()
   if ( !hGpkgDriver )
   {
     if ( !property( "hideDialogs" ).toBool() )
-      QMessageBox::critical( this, tr( "Layer creation failed" ),
-                             tr( "GeoPackage driver not found" ) );
+      QMessageBox::critical( this, tr( "New GeoPackage Layer" ),
+                             tr( "Layer creation failed. GeoPackage driver not found." ) );
     return false;
   }
 
@@ -324,7 +324,7 @@ bool QgsNewGeoPackageLayerDialog::apply()
     {
       QString msg( tr( "Creation of database failed (OGR error: %1)" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ) );
       if ( !property( "hideDialogs" ).toBool() )
-        QMessageBox::critical( this, tr( "Layer creation failed" ), msg );
+        QMessageBox::critical( this, tr( "New GeoPackage Layer" ), msg );
       return false;
     }
   }
@@ -336,14 +336,14 @@ bool QgsNewGeoPackageLayerDialog::apply()
     {
       QString msg( tr( "Opening of database failed (OGR error: %1)" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ) );
       if ( !property( "hideDialogs" ).toBool() )
-        QMessageBox::critical( this, tr( "Layer creation failed" ), msg );
+        QMessageBox::critical( this, tr( "New GeoPackage Layer" ), msg );
       return false;
     }
     if ( hDriver != hGpkgDriver )
     {
-      QString msg( tr( "Opening of file succeeded, but this is not a GeoPackage database" ) );
+      QString msg( tr( "Opening of file succeeded, but this is not a GeoPackage database." ) );
       if ( !property( "hideDialogs" ).toBool() )
-        QMessageBox::critical( this, tr( "Layer creation failed" ), msg );
+        QMessageBox::critical( this, tr( "New GeoPackage Layer" ), msg );
       return false;
     }
   }
@@ -357,7 +357,7 @@ bool QgsNewGeoPackageLayerDialog::apply()
     {
       overwriteTable = property( "question_existing_layer_answer_overwrite" ).toBool();
     }
-    else if ( QMessageBox::question( this, tr( "Existing layer" ),
+    else if ( QMessageBox::question( this, tr( "New GeoPackage Layer" ),
                                      tr( "A table with the same name already exists. Do you want to overwrite it?" ),
                                      QMessageBox::Yes | QMessageBox::No, QMessageBox::No ) == QMessageBox::Yes )
     {
@@ -421,7 +421,7 @@ bool QgsNewGeoPackageLayerDialog::apply()
   {
     QString msg( tr( "Creation of layer failed (OGR error: %1)" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ) );
     if ( !property( "hideDialogs" ).toBool() )
-      QMessageBox::critical( this, tr( "Layer creation failed" ), msg );
+      QMessageBox::critical( this, tr( "New GeoPackage Layer" ), msg );
     return false;
   }
 
@@ -455,7 +455,7 @@ bool QgsNewGeoPackageLayerDialog::apply()
     {
       if ( !property( "hideDialogs" ).toBool() )
       {
-        QMessageBox::critical( this, tr( "Layer creation failed" ),
+        QMessageBox::critical( this, tr( "New GeoPackage Layer" ),
                                tr( "Creation of field %1 failed (OGR error: %2)" )
                                .arg( fieldName, QString::fromUtf8( CPLGetLastErrorMsg() ) ) );
       }
@@ -473,7 +473,7 @@ bool QgsNewGeoPackageLayerDialog::apply()
   {
     QString msg( tr( "Creation of layer failed (OGR error: %1)" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ) );
     if ( !property( "hideDialogs" ).toBool() )
-      QMessageBox::critical( this, tr( "Layer creation failed" ), msg );
+      QMessageBox::critical( this, tr( "New GeoPackage Layer" ), msg );
     return false;
   }
   hDS.reset();
@@ -494,7 +494,7 @@ bool QgsNewGeoPackageLayerDialog::apply()
   else
   {
     if ( !property( "hideDialogs" ).toBool() )
-      QMessageBox::critical( this, tr( "Invalid Layer" ), tr( "%1 is an invalid layer and cannot be loaded." ).arg( tableName ) );
+      QMessageBox::critical( this, tr( "New GeoPackage Layer" ), tr( "%1 is an invalid layer and cannot be loaded." ).arg( tableName ) );
     delete layer;
   }
 
diff --git a/src/gui/qgsoptionsdialogbase.cpp b/src/gui/qgsoptionsdialogbase.cpp
index 69e901f6dfa..eb29f067db0 100644
--- a/src/gui/qgsoptionsdialogbase.cpp
+++ b/src/gui/qgsoptionsdialogbase.cpp
@@ -393,7 +393,7 @@ void QgsOptionsDialogBase::optionsStackedWidget_WidgetRemoved( int index )
 
 void QgsOptionsDialogBase::warnAboutMissingObjects()
 {
-  QMessageBox::warning( nullptr, tr( "Missing objects" ),
+  QMessageBox::warning( nullptr, tr( "Missing Objects" ),
                         tr( "Base options dialog could not be initialized.\n\n"
                             "Missing some of the .ui template objects:\n" )
                         + " mOptionsListWidget,\n mOptionsStackedWidget,\n mOptionsSplitter,\n mOptionsListFrame",
diff --git a/src/gui/qgsowssourceselect.cpp b/src/gui/qgsowssourceselect.cpp
index 29f95cfab75..bb96429783a 100644
--- a/src/gui/qgsowssourceselect.cpp
+++ b/src/gui/qgsowssourceselect.cpp
@@ -289,7 +289,7 @@ void QgsOWSSourceSelect::mDeleteButton_clicked()
 {
   QString msg = tr( "Are you sure you want to remove the %1 connection and all associated settings?" )
                 .arg( mConnectionsComboBox->currentText() );
-  QMessageBox::StandardButton result = QMessageBox::question( this, tr( "Confirm Delete" ), msg, QMessageBox::Yes | QMessageBox::No );
+  QMessageBox::StandardButton result = QMessageBox::question( this, tr( "Delete Connection" ), msg, QMessageBox::Yes | QMessageBox::No );
   if ( result == QMessageBox::Yes )
   {
     QgsOwsConnection::deleteConnection( mService, mConnectionsComboBox->currentText() );
@@ -631,9 +631,9 @@ void QgsOWSSourceSelect::addDefaultServers()
   settings.endGroup();
   populateConnectionList();
 
-  QMessageBox::information( this, tr( "WMS proxies" ), "<p>" + tr( "Several WMS servers have "
+  QMessageBox::information( this, tr( "Add WMS Servers" ), "<p>" + tr( "Several WMS servers have "
                             "been added to the server list. Note that if "
-                            "you access the internet via a web proxy, you will "
+                            "you access the Internet via a web proxy, you will "
                             "need to set the proxy settings in the QGIS options dialog." ) + "</p>" );
 }
 
diff --git a/src/gui/qgsquerybuilder.cpp b/src/gui/qgsquerybuilder.cpp
index 46753dd9698..f8535d928b5 100644
--- a/src/gui/qgsquerybuilder.cpp
+++ b/src/gui/qgsquerybuilder.cpp
@@ -233,7 +233,7 @@ void QgsQueryBuilder::test()
   else if ( mLayer->dataProvider()->hasErrors() )
   {
     QMessageBox::warning( this,
-                          tr( "Query Failed" ),
+                          tr( "Query Result" ),
                           tr( "An error occurred when executing the query." )
                           + tr( "\nThe data provider said:\n%1" ).arg( mLayer->dataProvider()->errors().join( QStringLiteral( "\n" ) ) ) );
     mLayer->dataProvider()->clearErrors();
@@ -241,7 +241,7 @@ void QgsQueryBuilder::test()
   else
   {
     QMessageBox::warning( this,
-                          tr( "Query Failed" ),
+                          tr( "Query Result" ),
                           tr( "An error occurred when executing the query." ) );
   }
 }
@@ -254,14 +254,14 @@ void QgsQueryBuilder::accept()
     if ( mLayer->dataProvider()->hasErrors() )
     {
       QMessageBox::warning( this,
-                            tr( "Query Failed" ),
+                            tr( "Query Result" ),
                             tr( "An error occurred when executing the query." )
                             + tr( "\nThe data provider said:\n%1" ).arg( mLayer->dataProvider()->errors().join( QStringLiteral( "\n" ) ) ) );
       mLayer->dataProvider()->clearErrors();
     }
     else
     {
-      QMessageBox::warning( this, tr( "Error in Query" ), tr( "The subset string could not be set" ) );
+      QMessageBox::warning( this, tr( "Query Result" ), tr( "Error in query. The subset string could not be set." ) );
     }
 
     return;
diff --git a/src/gui/qgsrasterformatsaveoptionswidget.cpp b/src/gui/qgsrasterformatsaveoptionswidget.cpp
index 3df98800f01..4e23c32028a 100644
--- a/src/gui/qgsrasterformatsaveoptionswidget.cpp
+++ b/src/gui/qgsrasterformatsaveoptionswidget.cpp
@@ -378,7 +378,7 @@ QString QgsRasterFormatSaveOptionsWidget::validateOptions( bool gui, bool report
   }
   else if ( ! createOptions.isEmpty() )
   {
-    QMessageBox::information( this, QLatin1String( "" ), tr( "Cannot validate creation options" ), QMessageBox::Close );
+    QMessageBox::information( this, QLatin1String( "" ), tr( "Cannot validate creation options." ), QMessageBox::Close );
     if ( tmpLayer )
       delete rasterLayer;
     return QString();
diff --git a/src/gui/qgsrasterlayersaveasdialog.cpp b/src/gui/qgsrasterlayersaveasdialog.cpp
index bb3b6370209..b50f90374eb 100644
--- a/src/gui/qgsrasterlayersaveasdialog.cpp
+++ b/src/gui/qgsrasterlayersaveasdialog.cpp
@@ -197,7 +197,7 @@ QgsRasterLayerSaveAsDialog::QgsRasterLayerSaveAsDialog( QgsRasterLayer *rasterLa
         if ( files.isEmpty() )
           break;
 
-        if ( QMessageBox::warning( this, tr( "Warning" ),
+        if ( QMessageBox::warning( this, tr( "Save Raster Layer" ),
                                    tr( "The directory %1 contains files which will be overwritten: %2" ).arg( dir.absolutePath(), files.join( QStringLiteral( ", " ) ) ),
                                    QMessageBox::Ok | QMessageBox::Cancel ) == QMessageBox::Ok )
           break;
diff --git a/src/gui/qgssearchquerybuilder.cpp b/src/gui/qgssearchquerybuilder.cpp
index e814fa57ba6..5bbad92cd45 100644
--- a/src/gui/qgssearchquerybuilder.cpp
+++ b/src/gui/qgssearchquerybuilder.cpp
@@ -195,7 +195,7 @@ void QgsSearchQueryBuilder::btnTest_clicked()
   if ( count == -1 )
     return;
 
-  QMessageBox::information( this, tr( "Search results" ), tr( "Found %n matching feature(s).", "test result", count ) );
+  QMessageBox::information( this, tr( "Test Query" ), tr( "Found %n matching feature(s).", "test result", count ) );
 }
 
 // This method tests the number of records that would be returned
@@ -204,7 +204,7 @@ long QgsSearchQueryBuilder::countRecords( const QString &searchString )
   QgsExpression search( searchString );
   if ( search.hasParserError() )
   {
-    QMessageBox::critical( this, tr( "Search string parsing error" ), search.parserErrorString() );
+    QMessageBox::critical( this, tr( "Query Result" ), search.parserErrorString() );
     return -1;
   }
 
@@ -220,7 +220,7 @@ long QgsSearchQueryBuilder::countRecords( const QString &searchString )
 
   if ( !search.prepare( &context ) )
   {
-    QMessageBox::critical( this, tr( "Evaluation error" ), search.evalErrorString() );
+    QMessageBox::critical( this, tr( "Query Result" ), search.evalErrorString() );
     return -1;
   }
 
@@ -237,7 +237,7 @@ long QgsSearchQueryBuilder::countRecords( const QString &searchString )
       count++;
     }
 
-    // check if there were errors during evaulating
+    // check if there were errors during evaluating
     if ( search.hasEvalError() )
       break;
   }
@@ -246,7 +246,7 @@ long QgsSearchQueryBuilder::countRecords( const QString &searchString )
 
   if ( search.hasEvalError() )
   {
-    QMessageBox::critical( this, tr( "Error during search" ), search.evalErrorString() );
+    QMessageBox::critical( this, tr( "Query Result" ), search.evalErrorString() );
     return -1;
   }
 
@@ -271,7 +271,7 @@ void QgsSearchQueryBuilder::btnOk_clicked()
   }
   else if ( numRecs == 0 )
   {
-    QMessageBox::warning( this, tr( "No Records" ), tr( "The query you specified results in zero records being returned." ) );
+    QMessageBox::warning( this, tr( "Query Result" ), tr( "The query you specified results in zero records being returned." ) );
   }
   else
   {
@@ -380,7 +380,7 @@ void QgsSearchQueryBuilder::saveQuery()
   QgsSettings s;
   QString lastQueryFileDir = s.value( QStringLiteral( "/UI/lastQueryFileDir" ), QDir::homePath() ).toString();
   //save as qqt (QGIS query file)
-  QString saveFileName = QFileDialog::getSaveFileName( nullptr, tr( "Save query to file" ), lastQueryFileDir, QStringLiteral( "*.qqf" ) );
+  QString saveFileName = QFileDialog::getSaveFileName( nullptr, tr( "Save Query to File" ), lastQueryFileDir, QStringLiteral( "*.qqf" ) );
   if ( saveFileName.isNull() )
   {
     return;
@@ -394,7 +394,7 @@ void QgsSearchQueryBuilder::saveQuery()
   QFile saveFile( saveFileName );
   if ( !saveFile.open( QIODevice::WriteOnly | QIODevice::Truncate ) )
   {
-    QMessageBox::critical( nullptr, tr( "Error" ), tr( "Could not open file for writing" ) );
+    QMessageBox::critical( nullptr, tr( "Save Query to File" ), tr( "Could not open file for writing." ) );
     return;
   }
 
@@ -416,7 +416,7 @@ void QgsSearchQueryBuilder::loadQuery()
   QgsSettings s;
   QString lastQueryFileDir = s.value( QStringLiteral( "/UI/lastQueryFileDir" ), QDir::homePath() ).toString();
 
-  QString queryFileName = QFileDialog::getOpenFileName( nullptr, tr( "Load query from file" ), lastQueryFileDir, tr( "Query files" ) + " (*.qqf);;" + tr( "All files" ) + " (*)" );
+  QString queryFileName = QFileDialog::getOpenFileName( nullptr, tr( "Load Query from File" ), lastQueryFileDir, tr( "Query files" ) + " (*.qqf);;" + tr( "All files" ) + " (*)" );
   if ( queryFileName.isNull() )
   {
     return;
@@ -425,20 +425,20 @@ void QgsSearchQueryBuilder::loadQuery()
   QFile queryFile( queryFileName );
   if ( !queryFile.open( QIODevice::ReadOnly ) )
   {
-    QMessageBox::critical( nullptr, tr( "Error" ), tr( "Could not open file for reading" ) );
+    QMessageBox::critical( nullptr, tr( "Load Query from File" ), tr( "Could not open file for reading." ) );
     return;
   }
   QDomDocument queryDoc;
   if ( !queryDoc.setContent( &queryFile ) )
   {
-    QMessageBox::critical( nullptr, tr( "Error" ), tr( "File is not a valid xml document" ) );
+    QMessageBox::critical( nullptr, tr( "Load Query from File" ), tr( "File is not a valid xml document." ) );
     return;
   }
 
   QDomElement queryElem = queryDoc.firstChildElement( QStringLiteral( "Query" ) );
   if ( queryElem.isNull() )
   {
-    QMessageBox::critical( nullptr, tr( "Error" ), tr( "File is not a valid query document" ) );
+    QMessageBox::critical( nullptr, tr( "Load Query from File" ), tr( "File is not a valid query document." ) );
     return;
   }
 
@@ -448,7 +448,7 @@ void QgsSearchQueryBuilder::loadQuery()
   QgsExpression search( query );
   if ( search.hasParserError() )
   {
-    QMessageBox::critical( this, tr( "Search string parsing error" ), search.parserErrorString() );
+    QMessageBox::critical( this, tr( "Query Result" ), search.parserErrorString() );
     return;
   }
 
@@ -476,7 +476,7 @@ void QgsSearchQueryBuilder::loadQuery()
     if ( !mFieldMap.contains( attIt ) )
     {
       bool ok;
-      QString replaceAttribute = QInputDialog::getItem( 0, tr( "Select attribute" ), tr( "There is no attribute '%1' in the current vector layer. Please select an existing attribute" ).arg( *attIt ),
+      QString replaceAttribute = QInputDialog::getItem( 0, tr( "Select Attribute" ), tr( "There is no attribute '%1' in the current vector layer. Please select an existing attribute." ).arg( *attIt ),
                                  existingAttributes, 0, false, &ok );
       if ( !ok || replaceAttribute.isEmpty() )
       {
diff --git a/src/gui/qgssqlcomposerdialog.cpp b/src/gui/qgssqlcomposerdialog.cpp
index ff3b5506913..025fe771418 100644
--- a/src/gui/qgssqlcomposerdialog.cpp
+++ b/src/gui/qgssqlcomposerdialog.cpp
@@ -213,12 +213,12 @@ void QgsSQLComposerDialog::accept()
     {
       if ( errorMsg.isEmpty() )
         errorMsg = tr( "An error occurred during evaluation of the SQL statement." );
-      QMessageBox::critical( this, tr( "SQL Error" ), errorMsg );
+      QMessageBox::critical( this, tr( "SQL Evaluation" ), errorMsg );
       return;
     }
     if ( !warningMsg.isEmpty() )
     {
-      QMessageBox::warning( this, tr( "SQL Warning" ), warningMsg );
+      QMessageBox::warning( this, tr( "SQL Evaluation" ), warningMsg );
     }
   }
   QDialog::accept();
diff --git a/src/gui/qgssubstitutionlistwidget.cpp b/src/gui/qgssubstitutionlistwidget.cpp
index 1319b19e23d..3e554d397d8 100644
--- a/src/gui/qgssubstitutionlistwidget.cpp
+++ b/src/gui/qgssubstitutionlistwidget.cpp
@@ -90,7 +90,7 @@ void QgsSubstitutionListWidget::tableChanged()
 
 void QgsSubstitutionListWidget::mButtonExport_clicked()
 {
-  QString fileName = QFileDialog::getSaveFileName( this, tr( "Save substitutions" ), QDir::homePath(),
+  QString fileName = QFileDialog::getSaveFileName( this, tr( "Save Substitutions" ), QDir::homePath(),
                      tr( "XML files (*.xml *.XML)" ) );
   if ( fileName.isEmpty() )
   {
@@ -113,8 +113,8 @@ void QgsSubstitutionListWidget::mButtonExport_clicked()
   QFile file( fileName );
   if ( !file.open( QIODevice::WriteOnly | QIODevice::Text | QIODevice::Truncate ) )
   {
-    QMessageBox::warning( nullptr, tr( "Export substitutions" ),
-                          tr( "Cannot write file %1:\n%2." ).arg( fileName, file.errorString() ),
+    QMessageBox::warning( nullptr, tr( "Export Substitutions" ),
+                          tr( "Cannot write file %1:\n%2" ).arg( fileName, file.errorString() ),
                           QMessageBox::Ok,
                           QMessageBox::Ok );
     return;
@@ -126,7 +126,7 @@ void QgsSubstitutionListWidget::mButtonExport_clicked()
 
 void QgsSubstitutionListWidget::mButtonImport_clicked()
 {
-  QString fileName = QFileDialog::getOpenFileName( this, tr( "Load substitutions" ), QDir::homePath(),
+  QString fileName = QFileDialog::getOpenFileName( this, tr( "Load Substitutions" ), QDir::homePath(),
                      tr( "XML files (*.xml *.XML)" ) );
   if ( fileName.isEmpty() )
   {
@@ -136,8 +136,8 @@ void QgsSubstitutionListWidget::mButtonImport_clicked()
   QFile file( fileName );
   if ( !file.open( QIODevice::ReadOnly | QIODevice::Text ) )
   {
-    QMessageBox::warning( nullptr, tr( "Import substitutions" ),
-                          tr( "Cannot read file %1:\n%2." ).arg( fileName, file.errorString() ),
+    QMessageBox::warning( nullptr, tr( "Import Substitutions" ),
+                          tr( "Cannot read file %1:\n%2" ).arg( fileName, file.errorString() ),
                           QMessageBox::Ok,
                           QMessageBox::Ok );
     return;
@@ -163,7 +163,7 @@ void QgsSubstitutionListWidget::mButtonImport_clicked()
   QDomElement root = doc.documentElement();
   if ( root.tagName() != QLatin1String( "substitutions" ) )
   {
-    QMessageBox::warning( nullptr, tr( "Import substitutions" ),
+    QMessageBox::warning( nullptr, tr( "Import Substitutions" ),
                           tr( "The selected file is not a substitution list." ),
                           QMessageBox::Ok,
                           QMessageBox::Ok );
diff --git a/src/gui/qgsvariableeditorwidget.cpp b/src/gui/qgsvariableeditorwidget.cpp
index 4dd2b7b19d9..5aa2c02cc3b 100644
--- a/src/gui/qgsvariableeditorwidget.cpp
+++ b/src/gui/qgsvariableeditorwidget.cpp
@@ -728,7 +728,7 @@ void VariableEditorDelegate::setModelData( QWidget *widget, QAbstractItemModel *
     if ( scope->hasVariable( newName ) )
     {
       //existing name
-      QMessageBox::warning( mParentTree, tr( "Rename variable" ), tr( "A variable with the name \"%1\" already exists in this context." ).arg( newName ) );
+      QMessageBox::warning( mParentTree, tr( "Rename Variable" ), tr( "A variable with the name \"%1\" already exists in this context." ).arg( newName ) );
       newName.append( "_1" );
     }
 
diff --git a/src/gui/raster/qgspalettedrendererwidget.cpp b/src/gui/raster/qgspalettedrendererwidget.cpp
index 5ed8e0e4055..f77c58fd678 100644
--- a/src/gui/raster/qgspalettedrendererwidget.cpp
+++ b/src/gui/raster/qgspalettedrendererwidget.cpp
@@ -350,7 +350,7 @@ void QgsPalettedRendererWidget::loadColorTable()
 {
   QgsSettings settings;
   QString lastDir = settings.value( QStringLiteral( "lastColorMapDir" ), QDir::homePath() ).toString();
-  QString fileName = QFileDialog::getOpenFileName( this, tr( "Open file" ), lastDir );
+  QString fileName = QFileDialog::getOpenFileName( this, tr( "Load Color Table from File" ), lastDir );
   if ( !fileName.isEmpty() )
   {
     QgsPalettedRasterRenderer::ClassData classes = QgsPalettedRasterRenderer::classDataFromFile( fileName );
@@ -363,7 +363,7 @@ void QgsPalettedRendererWidget::loadColorTable()
     }
     else
     {
-      QMessageBox::critical( nullptr, tr( "Invalid file" ), tr( "Could not interpret file as a raster color table." ) );
+      QMessageBox::critical( nullptr, tr( "Load Color Table" ), tr( "Could not interpret file as a raster color table." ) );
     }
   }
 }
@@ -372,7 +372,7 @@ void QgsPalettedRendererWidget::saveColorTable()
 {
   QgsSettings settings;
   QString lastDir = settings.value( QStringLiteral( "lastColorMapDir" ), QDir::homePath() ).toString();
-  QString fileName = QFileDialog::getSaveFileName( this, tr( "Save file" ), lastDir, tr( "Text (*.clr)" ) );
+  QString fileName = QFileDialog::getSaveFileName( this, tr( "Save Color Table as File" ), lastDir, tr( "Text (*.clr)" ) );
   if ( !fileName.isEmpty() )
   {
     if ( !fileName.endsWith( QLatin1String( ".clr" ), Qt::CaseInsensitive ) )
@@ -393,7 +393,7 @@ void QgsPalettedRendererWidget::saveColorTable()
     }
     else
     {
-      QMessageBox::warning( this, tr( "Write access denied" ), tr( "Write access denied. Adjust the file permissions and try again.\n\n" ) );
+      QMessageBox::warning( this, tr( "Save Color Table as File" ), tr( "Write access denied. Adjust the file permissions and try again.\n\n" ) );
     }
   }
 }
@@ -454,7 +454,7 @@ void QgsPalettedRendererWidget::bandChanged( int band )
   if ( !mModel->classData().isEmpty() )
   {
     int res = QMessageBox::question( this,
-                                     tr( "Confirm Delete" ),
+                                     tr( "Delete Classification" ),
                                      tr( "The classification band was changed from %1 to %2.\n"
                                          "Should the existing classes be deleted?" ).arg( mBand ).arg( band ),
                                      QMessageBox::Yes | QMessageBox::No );
diff --git a/src/gui/raster/qgsrastertransparencywidget.cpp b/src/gui/raster/qgsrastertransparencywidget.cpp
index ab626b53ced..77ddcf5a13c 100644
--- a/src/gui/raster/qgsrastertransparencywidget.cpp
+++ b/src/gui/raster/qgsrastertransparencywidget.cpp
@@ -222,7 +222,7 @@ void QgsRasterTransparencyWidget::pbnExportTransparentPixelValues_clicked()
 {
   QgsSettings myQSettings;
   QString myLastDir = myQSettings.value( QStringLiteral( "lastRasterFileFilterDir" ), QDir::homePath() ).toString();
-  QString myFileName = QFileDialog::getSaveFileName( this, tr( "Save file" ), myLastDir, tr( "Textfile" ) + " (*.txt)" );
+  QString myFileName = QFileDialog::getSaveFileName( this, tr( "Save Pixel Values as File" ), myLastDir, tr( "Textfile" ) + " (*.txt)" );
   if ( !myFileName.isEmpty() )
   {
     if ( !myFileName.endsWith( QLatin1String( ".txt" ), Qt::CaseInsensitive ) )
@@ -260,7 +260,7 @@ void QgsRasterTransparencyWidget::pbnExportTransparentPixelValues_clicked()
     }
     else
     {
-      QMessageBox::warning( this, tr( "Write access denied" ), tr( "Write access denied. Adjust the file permissions and try again.\n\n" ) );
+      QMessageBox::warning( this, tr( "Save Pixel Values as File" ), tr( "Write access denied. Adjust the file permissions and try again.\n\n" ) );
     }
   }
 }
@@ -272,7 +272,7 @@ void QgsRasterTransparencyWidget::pbnImportTransparentPixelValues_clicked()
   QString myBadLines;
   QgsSettings myQSettings;
   QString myLastDir = myQSettings.value( QStringLiteral( "lastRasterFileFilterDir" ), QDir::homePath() ).toString();
-  QString myFileName = QFileDialog::getOpenFileName( this, tr( "Open file" ), myLastDir, tr( "Textfile" ) + " (*.txt)" );
+  QString myFileName = QFileDialog::getOpenFileName( this, tr( "Load Pixel Values from File" ), myLastDir, tr( "Textfile" ) + " (*.txt)" );
   QFile myInputFile( myFileName );
   if ( myInputFile.open( QFile::ReadOnly ) )
   {
@@ -351,12 +351,12 @@ void QgsRasterTransparencyWidget::pbnImportTransparentPixelValues_clicked()
 
     if ( myImportError )
     {
-      QMessageBox::warning( this, tr( "Import Error" ), tr( "The following lines contained errors\n\n%1" ).arg( myBadLines ) );
+      QMessageBox::warning( this, tr( "Load Pixel Values from File" ), tr( "The following lines contained errors\n\n%1" ).arg( myBadLines ) );
     }
   }
   else if ( !myFileName.isEmpty() )
   {
-    QMessageBox::warning( this, tr( "Read access denied" ), tr( "Read access denied. Adjust the file permissions and try again.\n\n" ) );
+    QMessageBox::warning( this, tr( "Load Pixel Values from File" ), tr( "Read access denied. Adjust the file permissions and try again.\n\n" ) );
   }
   tableTransparency->resizeColumnsToContents();
   tableTransparency->resizeRowsToContents();
diff --git a/src/gui/raster/qgssinglebandpseudocolorrendererwidget.cpp b/src/gui/raster/qgssinglebandpseudocolorrendererwidget.cpp
index da8319bc05b..bb5348815ba 100644
--- a/src/gui/raster/qgssinglebandpseudocolorrendererwidget.cpp
+++ b/src/gui/raster/qgssinglebandpseudocolorrendererwidget.cpp
@@ -449,7 +449,7 @@ void QgsSingleBandPseudoColorRendererWidget::mLoadFromBandButton_clicked()
   }
   else
   {
-    QMessageBox::warning( this, tr( "Load Color Map" ), tr( "The color map for band %1 has no entries" ).arg( bandIndex ) );
+    QMessageBox::warning( this, tr( "Load Color Map" ), tr( "The color map for band %1 has no entries." ).arg( bandIndex ) );
   }
 
   loadMinMaxFromTree();
@@ -463,7 +463,7 @@ void QgsSingleBandPseudoColorRendererWidget::mLoadFromFileButton_clicked()
   QString badLines;
   QgsSettings settings;
   QString lastDir = settings.value( QStringLiteral( "lastColorMapDir" ), QDir::homePath() ).toString();
-  QString fileName = QFileDialog::getOpenFileName( this, tr( "Open file" ), lastDir, tr( "Textfile (*.txt)" ) );
+  QString fileName = QFileDialog::getOpenFileName( this, tr( "Load Color Map from File" ), lastDir, tr( "Textfile (*.txt)" ) );
   QFile inputFile( fileName );
   if ( inputFile.open( QFile::ReadOnly ) )
   {
@@ -536,12 +536,12 @@ void QgsSingleBandPseudoColorRendererWidget::mLoadFromFileButton_clicked()
 
     if ( importError )
     {
-      QMessageBox::warning( this, tr( "Import Error" ), tr( "The following lines contained errors\n\n" ) + badLines );
+      QMessageBox::warning( this, tr( "Load Color Map from File" ), tr( "The following lines contained errors\n\n" ) + badLines );
     }
   }
   else if ( !fileName.isEmpty() )
   {
-    QMessageBox::warning( this, tr( "Read access denied" ), tr( "Read access denied. Adjust the file permissions and try again.\n\n" ) );
+    QMessageBox::warning( this, tr( "Load Color Map from File" ), tr( "Read access denied. Adjust the file permissions and try again.\n\n" ) );
   }
 
   loadMinMaxFromTree();
@@ -552,7 +552,7 @@ void QgsSingleBandPseudoColorRendererWidget::mExportToFileButton_clicked()
 {
   QgsSettings settings;
   QString lastDir = settings.value( QStringLiteral( "lastColorMapDir" ), QDir::homePath() ).toString();
-  QString fileName = QFileDialog::getSaveFileName( this, tr( "Save file" ), lastDir, tr( "Textfile (*.txt)" ) );
+  QString fileName = QFileDialog::getSaveFileName( this, tr( "Save Color Map as File" ), lastDir, tr( "Textfile (*.txt)" ) );
   if ( !fileName.isEmpty() )
   {
     if ( !fileName.endsWith( QLatin1String( ".txt" ), Qt::CaseInsensitive ) )
@@ -610,7 +610,7 @@ void QgsSingleBandPseudoColorRendererWidget::mExportToFileButton_clicked()
     }
     else
     {
-      QMessageBox::warning( this, tr( "Write access denied" ), tr( "Write access denied. Adjust the file permissions and try again.\n\n" ) );
+      QMessageBox::warning( this, tr( "Save Color Map as File" ), tr( "Write access denied. Adjust the file permissions and try again.\n\n" ) );
     }
   }
 }
@@ -625,7 +625,7 @@ void QgsSingleBandPseudoColorRendererWidget::mColormapTreeWidget_itemDoubleClick
   if ( column == ColorColumn )
   {
     item->setFlags( Qt::ItemIsEnabled | Qt::ItemIsSelectable );
-    QColor newColor = QgsColorDialog::getColor( item->background( column ).color(), this, QStringLiteral( "Change color" ), true );
+    QColor newColor = QgsColorDialog::getColor( item->background( column ).color(), this, QStringLiteral( "Change Color" ), true );
     if ( newColor.isValid() )
     {
       item->setBackground( ColorColumn, QBrush( newColor ) );
@@ -851,7 +851,7 @@ void QgsSingleBandPseudoColorRendererWidget::changeColor()
   }
   QTreeWidgetItem *firstItem = itemList.first();
 
-  QColor newColor = QgsColorDialog::getColor( firstItem->background( ColorColumn ).color(), this, QStringLiteral( "Change color" ), true );
+  QColor newColor = QgsColorDialog::getColor( firstItem->background( ColorColumn ).color(), this, QStringLiteral( "Change Color" ), true );
   if ( newColor.isValid() )
   {
     Q_FOREACH ( QTreeWidgetItem *item, itemList )
diff --git a/src/gui/symbology/qgscategorizedsymbolrendererwidget.cpp b/src/gui/symbology/qgscategorizedsymbolrendererwidget.cpp
index 817745be3c5..2c9ee1c6e96 100644
--- a/src/gui/symbology/qgscategorizedsymbolrendererwidget.cpp
+++ b/src/gui/symbology/qgscategorizedsymbolrendererwidget.cpp
@@ -658,8 +658,8 @@ void QgsCategorizedSymbolRendererWidget::addCategories()
   // ask to abort if too many classes
   if ( unique_vals.size() >= 1000 )
   {
-    int res = QMessageBox::warning( nullptr, tr( "High number of classes!" ),
-                                    tr( "Classification would yield %1 entries which might not be expected. Continue?" ).arg( unique_vals.size() ),
+    int res = QMessageBox::warning( nullptr, tr( "Classify Categories" ),
+                                    tr( "High number of classes. Classification would yield %1 entries which might not be expected. Continue?" ).arg( unique_vals.size() ),
                                     QMessageBox::Ok | QMessageBox::Cancel,
                                     QMessageBox::Cancel );
     if ( res == QMessageBox::Cancel )
@@ -683,7 +683,7 @@ void QgsCategorizedSymbolRendererWidget::addCategories()
        !mRenderer->categories().isEmpty() )
   {
     int res = QMessageBox::question( this,
-                                     tr( "Confirm Delete" ),
+                                     tr( "Delete Classification" ),
                                      tr( "The classification field was changed from '%1' to '%2'.\n"
                                          "Should the existing classes be deleted before classification?" )
                                      .arg( mOldClassificationAttribute, attrName ),
@@ -910,7 +910,7 @@ void QgsCategorizedSymbolRendererWidget::matchToSymbolsFromXml()
   QgsSettings settings;
   QString openFileDir = settings.value( QStringLiteral( "UI/lastMatchToSymbolsDir" ), QDir::homePath() ).toString();
 
-  QString fileName = QFileDialog::getOpenFileName( this, tr( "Match to symbols from file" ), openFileDir,
+  QString fileName = QFileDialog::getOpenFileName( this, tr( "Match to Symbols from File" ), openFileDir,
                      tr( "XML files (*.xml *XML)" ) );
   if ( fileName.isEmpty() )
   {
@@ -923,7 +923,7 @@ void QgsCategorizedSymbolRendererWidget::matchToSymbolsFromXml()
   QgsStyle importedStyle;
   if ( !importedStyle.importXml( fileName ) )
   {
-    QMessageBox::warning( this, tr( "Matching Error" ),
+    QMessageBox::warning( this, tr( "Match to Symbols from File" ),
                           tr( "An error occurred while reading file:\n%1" ).arg( importedStyle.errorString() ) );
     return;
   }
@@ -931,12 +931,12 @@ void QgsCategorizedSymbolRendererWidget::matchToSymbolsFromXml()
   int matched = matchToSymbols( &importedStyle );
   if ( matched > 0 )
   {
-    QMessageBox::information( this, tr( "Matched Symbols" ),
+    QMessageBox::information( this, tr( "Match to Symbols from File" ),
                               tr( "Matched %1 categories to symbols from file." ).arg( matched ) );
   }
   else
   {
-    QMessageBox::warning( this, tr( "Matched Symbols" ),
+    QMessageBox::warning( this, tr( "Match to Symbols from File" ),
                           tr( "No categories could be matched to symbols in file." ) );
   }
 }
diff --git a/src/gui/symbology/qgsgraduatedsymbolrendererwidget.cpp b/src/gui/symbology/qgsgraduatedsymbolrendererwidget.cpp
index c5ab2edf0ce..e82ad4af67f 100644
--- a/src/gui/symbology/qgsgraduatedsymbolrendererwidget.cpp
+++ b/src/gui/symbology/qgsgraduatedsymbolrendererwidget.cpp
@@ -690,7 +690,7 @@ void QgsGraduatedSymbolRendererWidget::methodComboBox_currentIndexChanged( int i
 
     if ( !ramp )
     {
-      QMessageBox::critical( this, tr( "Error" ), tr( "No color ramp defined." ) );
+      QMessageBox::critical( this, tr( "Select Method" ), tr( "No color ramp defined." ) );
       return;
     }
     mRenderer->setSourceColorRamp( ramp );
@@ -803,7 +803,7 @@ void QgsGraduatedSymbolRendererWidget::classifyGraduated()
   std::unique_ptr<QgsColorRamp> ramp( btnColorRamp->colorRamp() );
   if ( !ramp )
   {
-    QMessageBox::critical( this, tr( "Error" ), tr( "No color ramp defined." ) );
+    QMessageBox::critical( this, tr( "Apply Classification" ), tr( "No color ramp defined." ) );
     return;
   }
 
@@ -823,7 +823,7 @@ void QgsGraduatedSymbolRendererWidget::classifyGraduated()
   // and give the user the chance to cancel
   if ( QgsGraduatedSymbolRenderer::Jenks == mode && mLayer->featureCount() > 50000 )
   {
-    if ( QMessageBox::Cancel == QMessageBox::question( this, tr( "Warning" ), tr( "Natural break classification (Jenks) is O(n2) complexity, your classification may take a long time.\nPress cancel to abort breaks calculation or OK to continue." ), QMessageBox::Cancel, QMessageBox::Ok ) )
+    if ( QMessageBox::Cancel == QMessageBox::question( this, tr( "Apply Classification" ), tr( "Natural break classification (Jenks) is O(n2) complexity, your classification may take a long time.\nPress cancel to abort breaks calculation or OK to continue." ), QMessageBox::Cancel, QMessageBox::Ok ) )
       return;
   }
 
@@ -836,7 +836,7 @@ void QgsGraduatedSymbolRendererWidget::classifyGraduated()
   {
     if ( !ramp )
     {
-      QMessageBox::critical( this, tr( "Error" ), tr( "No color ramp defined." ) );
+      QMessageBox::critical( this, tr( "Apply Classification" ), tr( "No color ramp defined." ) );
       return;
     }
     mRenderer->setSourceColorRamp( ramp.release() );
@@ -1047,7 +1047,7 @@ void QgsGraduatedSymbolRendererWidget::toggleBoundariesLink( bool linked )
     {
       int result = QMessageBox::warning(
                      this,
-                     tr( "Linked range warning" ),
+                     tr( "Link Class Boundaries" ),
                      tr( "Rows will be reordered before linking boundaries. Continue?" ),
                      QMessageBox::Ok | QMessageBox::Cancel );
       if ( result != QMessageBox::Ok )
diff --git a/src/gui/symbology/qgsrendererwidget.cpp b/src/gui/symbology/qgsrendererwidget.cpp
index 225f1766a6f..289038f5b82 100644
--- a/src/gui/symbology/qgsrendererwidget.cpp
+++ b/src/gui/symbology/qgsrendererwidget.cpp
@@ -288,7 +288,7 @@ QgsDataDefinedSizeLegendWidget *QgsRendererWidget::createDataDefinedSizeLegendWi
   QgsProperty ddSize = symbol->dataDefinedSize();
   if ( !ddSize || !ddSize.isActive() )
   {
-    QMessageBox::warning( this, tr( "Data-defined size legend" ), tr( "Data-defined size is not enabled!" ) );
+    QMessageBox::warning( this, tr( "Data-defined Size Legend" ), tr( "Data-defined size is not enabled!" ) );
     return nullptr;
   }
 
diff --git a/src/gui/symbology/qgsrulebasedrendererwidget.cpp b/src/gui/symbology/qgsrulebasedrendererwidget.cpp
index 0e01492567b..0a9f887b156 100644
--- a/src/gui/symbology/qgsrulebasedrendererwidget.cpp
+++ b/src/gui/symbology/qgsrulebasedrendererwidget.cpp
@@ -316,7 +316,7 @@ void QgsRuleBasedRendererWidget::refineRuleScalesGui( const QModelIndexList &ind
     if ( ok )
       scales.append( scale );
     else
-      QMessageBox::information( this, tr( "Error" ), QString( tr( "\"%1\" is not valid scale denominator, ignoring it." ) ).arg( item ) );
+      QMessageBox::information( this, tr( "Scale Refinement" ), QString( tr( "\"%1\" is not valid scale denominator, ignoring it." ) ).arg( item ) );
   }
 
   Q_FOREACH ( const QModelIndex &index, indexList )
@@ -757,7 +757,7 @@ void QgsRendererRulePropsWidget::testFilter()
   QgsExpression filter( editFilter->text() );
   if ( filter.hasParserError() )
   {
-    QMessageBox::critical( this, tr( "Error" ),  tr( "Filter expression parsing error:\n" ) + filter.parserErrorString() );
+    QMessageBox::critical( this, tr( "Test Filter" ),  tr( "Filter expression parsing error:\n" ) + filter.parserErrorString() );
     return;
   }
 
@@ -771,7 +771,7 @@ void QgsRendererRulePropsWidget::testFilter()
 
   if ( !filter.prepare( &context ) )
   {
-    QMessageBox::critical( this, tr( "Evaluation error" ), filter.evalErrorString() );
+    QMessageBox::critical( this, tr( "Test Filter" ), filter.evalErrorString() );
     return;
   }
 
@@ -793,7 +793,7 @@ void QgsRendererRulePropsWidget::testFilter()
 
   QApplication::restoreOverrideCursor();
 
-  QMessageBox::information( this, tr( "Filter" ), tr( "Filter returned %n feature(s)", "number of filtered features", count ) );
+  QMessageBox::information( this, tr( "Test Filter" ), tr( "Filter returned %n feature(s)", "number of filtered features", count ) );
 }
 
 void QgsRendererRulePropsWidget::apply()
diff --git a/src/gui/symbology/qgssmartgroupeditordialog.cpp b/src/gui/symbology/qgssmartgroupeditordialog.cpp
index a0fa5dd4286..65050772455 100644
--- a/src/gui/symbology/qgssmartgroupeditordialog.cpp
+++ b/src/gui/symbology/qgssmartgroupeditordialog.cpp
@@ -194,7 +194,7 @@ void QgsSmartGroupEditorDialog::buttonBox_accepted()
 {
   if ( mNameLineEdit->text().isEmpty() )
   {
-    QMessageBox::critical( this, tr( "Invalid name" ), tr( "The smart group name field is empty. Kindly provide a name." ) );
+    QMessageBox::critical( this, tr( "Edit Smart Group" ), tr( "The smart group name field is empty. Kindly provide a name." ) );
     return;
   }
   accept();
diff --git a/src/gui/symbology/qgsstyleexportimportdialog.cpp b/src/gui/symbology/qgsstyleexportimportdialog.cpp
index b1f9b0548db..f36a2ea69bb 100644
--- a/src/gui/symbology/qgsstyleexportimportdialog.cpp
+++ b/src/gui/symbology/qgsstyleexportimportdialog.cpp
@@ -121,14 +121,14 @@ void QgsStyleExportImportDialog::doExportImport()
   QModelIndexList selection = listItems->selectionModel()->selectedIndexes();
   if ( selection.isEmpty() )
   {
-    QMessageBox::warning( this, tr( "Export/import error" ),
+    QMessageBox::warning( this, tr( "Export/import Symbols or Color Ramps" ),
                           tr( "You should select at least one symbol/color ramp." ) );
     return;
   }
 
   if ( mDialogMode == Export )
   {
-    QString fileName = QFileDialog::getSaveFileName( this, tr( "Save styles" ), QDir::homePath(),
+    QString fileName = QFileDialog::getSaveFileName( this, tr( "Save Styles" ), QDir::homePath(),
                        tr( "XML files (*.xml *.XML)" ) );
     if ( fileName.isEmpty() )
     {
@@ -146,14 +146,14 @@ void QgsStyleExportImportDialog::doExportImport()
     moveStyles( &selection, mStyle, mTempStyle );
     if ( !mTempStyle->exportXml( mFileName ) )
     {
-      QMessageBox::warning( this, tr( "Export/import error" ),
+      QMessageBox::warning( this, tr( "Export Symbols" ),
                             tr( "Error when saving selected symbols to file:\n%1" )
                             .arg( mTempStyle->errorString() ) );
       return;
     }
     else
     {
-      QMessageBox::information( this, tr( "Export successful" ),
+      QMessageBox::information( this, tr( "Export Symbols" ),
                                 tr( "The selected symbols were successfully exported to file:\n%1" )
                                 .arg( mFileName ) );
     }
@@ -180,7 +180,7 @@ bool QgsStyleExportImportDialog::populateStyles( QgsStyle *style )
     // NOTE mTempStyle is style here
     if ( !style->importXml( mFileName ) )
     {
-      QMessageBox::warning( this, tr( "Import Error" ),
+      QMessageBox::warning( this, tr( "Import Symbols or Color Ramps" ),
                             tr( "An error occurred during import:\n%1" ).arg( style->errorString() ) );
       return false;
     }
@@ -278,7 +278,7 @@ void QgsStyleExportImportDialog::moveStyles( QModelIndexList *selection, QgsStyl
     {
       if ( dst->symbolNames().contains( symbolName ) && prompt )
       {
-        int res = QMessageBox::warning( this, tr( "Duplicate Names" ),
+        int res = QMessageBox::warning( this, tr( "Export/import Symbols" ),
                                         tr( "Symbol with name '%1' already exists.\nOverwrite?" )
                                         .arg( symbolName ),
                                         QMessageBox::Yes | QMessageBox::YesToAll | QMessageBox::No | QMessageBox::NoToAll | QMessageBox::Cancel );
@@ -322,7 +322,7 @@ void QgsStyleExportImportDialog::moveStyles( QModelIndexList *selection, QgsStyl
     {
       if ( dst->colorRampNames().contains( symbolName ) && prompt )
       {
-        int res = QMessageBox::warning( this, tr( "Duplicate Names" ),
+        int res = QMessageBox::warning( this, tr( "Export/import Color Ramps" ),
                                         tr( "Color ramp with name '%1' already exists.\nOverwrite?" )
                                         .arg( symbolName ),
                                         QMessageBox::Yes | QMessageBox::YesToAll | QMessageBox::No | QMessageBox::NoToAll | QMessageBox::Cancel );
@@ -482,7 +482,7 @@ void QgsStyleExportImportDialog::browse()
 
   if ( type == QLatin1String( "file" ) )
   {
-    mFileName = QFileDialog::getOpenFileName( this, tr( "Load styles" ), QDir::homePath(),
+    mFileName = QFileDialog::getOpenFileName( this, tr( "Load Styles" ), QDir::homePath(),
                 tr( "XML files (*.xml *XML)" ) );
     if ( mFileName.isEmpty() )
     {
@@ -549,8 +549,8 @@ void QgsStyleExportImportDialog::httpFinished()
     mTempFile->remove();
     mFileName.clear();
     mProgressDlg->hide();
-    QMessageBox::information( this, tr( "HTTP Error!" ),
-                              tr( "Download failed: %1." ).arg( mNetReply->errorString() ) );
+    QMessageBox::information( this, tr( "Import from URL" ),
+                              tr( "HTTP Error! Download failed: %1." ).arg( mNetReply->errorString() ) );
     return;
   }
   else
diff --git a/src/gui/symbology/qgsstylemanagerdialog.cpp b/src/gui/symbology/qgsstylemanagerdialog.cpp
index 852dfe7a484..ea18ce50ca9 100644
--- a/src/gui/symbology/qgsstylemanagerdialog.cpp
+++ b/src/gui/symbology/qgsstylemanagerdialog.cpp
@@ -420,12 +420,12 @@ bool QgsStyleManagerDialog::addSymbol()
     // validate name
     if ( name.isEmpty() )
     {
-      QMessageBox::warning( this, tr( "Save symbol" ),
+      QMessageBox::warning( this, tr( "Save Symbol" ),
                             tr( "Cannot save symbol without name. Enter a name." ) );
     }
     else if ( mStyle->symbolNames().contains( name ) )
     {
-      int res = QMessageBox::warning( this, tr( "Save symbol" ),
+      int res = QMessageBox::warning( this, tr( "Save Symbol" ),
                                       tr( "Symbol with name '%1' already exists. Overwrite?" )
                                       .arg( name ),
                                       QMessageBox::Yes | QMessageBox::No );
@@ -474,7 +474,7 @@ QString QgsStyleManagerDialog::addColorRampStatic( QWidget *parent, QgsStyle *st
     QStringList rampTypes;
     rampTypes << tr( "Gradient" ) << tr( "Color presets" ) << tr( "Random" ) << tr( "Catalog: cpt-city" );
     rampTypes << tr( "Catalog: ColorBrewer" );
-    rampType = QInputDialog::getItem( parent, tr( "Color ramp type" ),
+    rampType = QInputDialog::getItem( parent, tr( "Color Ramp Type" ),
                                       tr( "Please select color ramp type:" ), rampTypes, 0, false, &ok );
   }
   if ( !ok || rampType.isEmpty() )
@@ -569,7 +569,7 @@ QString QgsStyleManagerDialog::addColorRampStatic( QWidget *parent, QgsStyle *st
     }
     else if ( style->colorRampNames().contains( name ) )
     {
-      int res = QMessageBox::warning( parent, tr( "Save color ramp" ),
+      int res = QMessageBox::warning( parent, tr( "Save Color Ramp" ),
                                       tr( "Color ramp with name '%1' already exists. Overwrite?" )
                                       .arg( name ),
                                       QMessageBox::Yes | QMessageBox::No );
@@ -771,7 +771,7 @@ void QgsStyleManagerDialog::removeItem()
 bool QgsStyleManagerDialog::removeSymbol()
 {
   QModelIndexList indexes = listItems->selectionModel()->selectedIndexes();
-  if ( QMessageBox::Yes != QMessageBox::question( this, tr( "Confirm removal" ),
+  if ( QMessageBox::Yes != QMessageBox::question( this, tr( "Remove Symbol" ),
        QString( tr( "Do you really want to remove %n symbol(s)?", nullptr, indexes.count() ) ),
        QMessageBox::Yes,
        QMessageBox::No ) )
@@ -791,7 +791,7 @@ bool QgsStyleManagerDialog::removeSymbol()
 bool QgsStyleManagerDialog::removeColorRamp()
 {
   QModelIndexList indexes = listItems->selectionModel()->selectedIndexes();
-  if ( QMessageBox::Yes != QMessageBox::question( this, tr( "Confirm removal" ),
+  if ( QMessageBox::Yes != QMessageBox::question( this, tr( "Remove Color Ramp" ),
        QString( tr( "Do you really want to remove %n ramp(s)?", nullptr, indexes.count() ) ),
        QMessageBox::Yes,
        QMessageBox::No ) )
@@ -830,7 +830,7 @@ void QgsStyleManagerDialog::itemChanged( QStandardItem *item )
   }
   else
   {
-    QMessageBox::critical( this, tr( "Cannot rename item" ),
+    QMessageBox::critical( this, tr( "Save Item" ),
                            tr( "Name is already taken by another item. Choose a different name." ) );
     item->setText( oldName );
   }
@@ -838,7 +838,7 @@ void QgsStyleManagerDialog::itemChanged( QStandardItem *item )
 
 void QgsStyleManagerDialog::exportItemsPNG()
 {
-  QString dir = QFileDialog::getExistingDirectory( this, tr( "Exported selected symbols as PNG" ),
+  QString dir = QFileDialog::getExistingDirectory( this, tr( "Export Selected Symbols as PNG" ),
                 QDir::home().absolutePath(),
                 QFileDialog::ShowDirsOnly
                 | QFileDialog::DontResolveSymlinks );
@@ -847,7 +847,7 @@ void QgsStyleManagerDialog::exportItemsPNG()
 
 void QgsStyleManagerDialog::exportItemsSVG()
 {
-  QString dir = QFileDialog::getExistingDirectory( this, tr( "Exported selected symbols as SVG" ),
+  QString dir = QFileDialog::getExistingDirectory( this, tr( "Export Selected Symbols as SVG" ),
                 QDir::home().absolutePath(),
                 QFileDialog::ShowDirsOnly
                 | QFileDialog::DontResolveSymlinks );
@@ -1061,7 +1061,7 @@ int QgsStyleManagerDialog::addTag()
   QString itemName;
   int id;
   bool ok;
-  itemName = QInputDialog::getText( this, tr( "Tag name" ),
+  itemName = QInputDialog::getText( this, tr( "Add Tag" ),
                                     tr( "Please enter name for the new tag:" ), QLineEdit::Normal, tr( "New tag" ), &ok ).trimmed();
   if ( !ok || itemName.isEmpty() )
     return 0;
@@ -1069,14 +1069,14 @@ int QgsStyleManagerDialog::addTag()
   int check = mStyle->tagId( itemName );
   if ( check > 0 )
   {
-    QMessageBox::critical( this, tr( "Error!" ),
+    QMessageBox::critical( this, tr( "Add Tag" ),
                            tr( "Tag name already exists in your symbol database." ) );
     return 0;
   }
   id = mStyle->addTag( itemName );
   if ( !id )
   {
-    QMessageBox::critical( this, tr( "Error!" ),
+    QMessageBox::critical( this, tr( "Add Tag" ),
                            tr( "New tag could not be created.\n"
                                "There was a problem with your symbol database." ) );
     return 0;
@@ -1131,8 +1131,8 @@ void QgsStyleManagerDialog::removeGroup()
   QString data = index.data( Qt::UserRole + 1 ).toString();
   if ( data == QLatin1String( "all" ) || data == QLatin1String( "favorite" ) || data == QLatin1String( "tags" ) || index.data() == "smartgroups" )
   {
-    int err = QMessageBox::critical( this, tr( "Invalid selection" ),
-                                     tr( "Cannot delete system defined categories.\n"
+    int err = QMessageBox::critical( this, tr( "Remove Group" ),
+                                     tr( "Invalid selection. Cannot delete system defined categories.\n"
                                          "Kindly select a group or smart group you might want to delete." ) );
     if ( err )
       return;
@@ -1254,8 +1254,8 @@ void QgsStyleManagerDialog::regrouped( QStandardItem *item )
     regrouped = mStyle->detagSymbol( type, symbolName, QStringList( tag ) );
   if ( !regrouped )
   {
-    int er = QMessageBox::critical( this, tr( "Database Error" ),
-                                    tr( "There was a problem with the Symbols database while regrouping." ) );
+    int er = QMessageBox::critical( this, tr( "Group Items" ),
+                                    tr( "There was a problem with the symbols database while regrouping." ) );
     // call the slot again to get back to normal
     if ( er )
       tagSymbolsAction();
@@ -1502,7 +1502,7 @@ void QgsStyleManagerDialog::editSmartgroupAction()
   QModelIndex present = groupTree->currentIndex();
   if ( present.parent().data( Qt::UserRole + 1 ) != "smartgroups" )
   {
-    QMessageBox::critical( this, tr( "Invalid Selection" ),
+    QMessageBox::critical( this, tr( "Edit Smart Group" ),
                            tr( "You have not selected a Smart Group. Kindly select a Smart Group to edit." ) );
     return;
   }
@@ -1521,7 +1521,7 @@ void QgsStyleManagerDialog::editSmartgroupAction()
   int id = mStyle->addSmartgroup( dlg.smartgroupName(), dlg.conditionOperator(), dlg.conditionMap() );
   if ( !id )
   {
-    QMessageBox::critical( this, tr( "Database Error!" ),
+    QMessageBox::critical( this, tr( "Edit Smart Group" ),
                            tr( "There was some error while editing the smart group." ) );
     return;
   }
diff --git a/src/gui/symbology/qgssymbollayerwidget.cpp b/src/gui/symbology/qgssymbollayerwidget.cpp
index 02d7dda48fb..3a5f3c53144 100644
--- a/src/gui/symbology/qgssymbollayerwidget.cpp
+++ b/src/gui/symbology/qgssymbollayerwidget.cpp
@@ -187,7 +187,7 @@ QgsSimpleLineSymbolLayerWidget::QgsSimpleLineSymbolLayerWidget( QgsVectorLayer *
                                     << QgsUnitTypes::RenderPoints << QgsUnitTypes::RenderInches );
 
   btnChangeColor->setAllowOpacity( true );
-  btnChangeColor->setColorDialogTitle( tr( "Select Line color" ) );
+  btnChangeColor->setColorDialogTitle( tr( "Select Line Color" ) );
   btnChangeColor->setContext( QStringLiteral( "symbology" ) );
 
   spinOffset->setClearValue( 0.0 );
@@ -1390,12 +1390,12 @@ QgsShapeburstFillSymbolLayerWidget::QgsShapeburstFillSymbolLayerWidget( QgsVecto
   group2->addButton( mRadioUseMaxDistance );
   group2->addButton( mRadioUseWholeShape );
   btnChangeColor->setAllowOpacity( true );
-  btnChangeColor->setColorDialogTitle( tr( "Select Gradient color" ) );
+  btnChangeColor->setColorDialogTitle( tr( "Select Gradient Color" ) );
   btnChangeColor->setContext( QStringLiteral( "symbology" ) );
   btnChangeColor->setShowNoColor( true );
   btnChangeColor->setNoColorString( tr( "Transparent" ) );
   btnChangeColor2->setAllowOpacity( true );
-  btnChangeColor2->setColorDialogTitle( tr( "Select Gradient color" ) );
+  btnChangeColor2->setColorDialogTitle( tr( "Select Gradient Color" ) );
   btnChangeColor2->setContext( QStringLiteral( "symbology" ) );
   btnChangeColor2->setShowNoColor( true );
   btnChangeColor2->setNoColorString( tr( "Transparent" ) );
@@ -2373,7 +2373,7 @@ QgsSymbolLayer *QgsSVGFillSymbolLayerWidget::symbolLayer()
 
 void QgsSVGFillSymbolLayerWidget::mBrowseToolButton_clicked()
 {
-  QString filePath = QFileDialog::getOpenFileName( nullptr, tr( "Select SVG texture file" ), QDir::homePath(), tr( "SVG file" ) + " (*.svg);;" + tr( "All files" ) + " (*.*)" );
+  QString filePath = QFileDialog::getOpenFileName( nullptr, tr( "Select SVG Texture File" ), QDir::homePath(), tr( "SVG file" ) + " (*.svg);;" + tr( "All files" ) + " (*.*)" );
   if ( !filePath.isNull() )
   {
     mSVGLineEdit->setText( filePath );
@@ -3237,14 +3237,14 @@ void QgsRasterFillSymbolLayerWidget::mBrowseToolButton_clicked()
   }
 
   //show file dialog
-  QString filePath = QFileDialog::getOpenFileName( nullptr, tr( "Select image file" ), openDir );
+  QString filePath = QFileDialog::getOpenFileName( nullptr, tr( "Select Image File" ), openDir );
   if ( !filePath.isNull() )
   {
     //check if file exists
     QFileInfo fileInfo( filePath );
     if ( !fileInfo.exists() || !fileInfo.isReadable() )
     {
-      QMessageBox::critical( nullptr, QStringLiteral( "Invalid file" ), QStringLiteral( "Error, file does not exist or is not readable" ) );
+      QMessageBox::critical( nullptr, QStringLiteral( "Select Image File" ), QStringLiteral( "Error, file does not exist or is not readable." ) );
       return;
     }