Improper use of no-translation (notr) attribute

"Preview only (N/A)" must be translated
"toolBar1" although it's a window title it will never show up, so better
not request translation.

src/MainWindow.ui

@@ -47,7 +47,7 @@
         <item>
          <widget class="QToolBar" name="dbToolbar">
           <property name="windowTitle">
-           <string>toolBar1</string>
+           <string notr="true">toolBar1</string>
           </property>
           <property name="toolButtonStyle">
            <enum>Qt::ToolButtonTextBesideIcon</enum>

src/PreferencesDialog.ui

@@ -669,7 +669,7 @@
                </font>
               </property>
               <property name="text">
-               <string notr="true">Preview only (N/A)</string>
+               <string>Preview only (N/A)</string>
               </property>
               <property name="readOnly">
                <bool>true</bool>