message: add file menu shortcuts into lumina-textedit
diff: </property>
  <widget class="QMenu" name="menuFile">
  <property name="title">
  - <string>File</string>
  + <string>&amp;File</string>
  </property>
  <addaction name="actionNew_File"/>
  <addaction name="actionOpen_File"/>
  </widget>
  <widget class="QMenu" name="menuView">
  <property name="title">
  - <string>View</string>
  + <string>&amp;View</string>
  </property>
  <widget class="QMenu" name="menuSyntax_Highlighting">
  <property name="title">
  </widget>
  <widget class="QMenu" name="menuEdit">
  <property name="title">
  - <string>Edit</string>
  + <string>&amp;Edit</string>
  </property>
  <addaction name="actionFind"/>
  <addaction name="actionReplace"/>
  