[needs-docs] Reword the "Enable layer" button

to "Enable symbol layer" and harmonize tooltips to mention symbol layer

fixes #33860

src/ui/qgssymbolselectordialogbase.ui

@@ -109,7 +109,7 @@
           </size>
          </property>
          <property name="toolTip">
-          <string>Duplicates the current layer</string>
+          <string>Duplicate symbol layer</string>
          </property>
          <property name="text">
           <string/>
@@ -174,7 +174,7 @@
           </size>
          </property>
          <property name="toolTip">
-          <string>Lock layer's color</string>
+          <string>Lock symbol layer's color</string>
          </property>
          <property name="checkable">
           <bool>true</bool>

src/ui/symbollayer/widget_layerproperties.ui

@@ -79,7 +79,7 @@
      <item>
       <widget class="QCheckBox" name="mEnabledCheckBox">
        <property name="text">
-        <string>Enable layer</string>
+        <string>Enable symbol layer</string>
        </property>
       </widget>
      </item>