message: add shortcuts
diff: <x>0</x>
  <y>0</y>
  <width>524</width>
  - <height>22</height>
  + <height>26</height>
  </rect>
  </property>
  <widget class="QMenu" name="menuFile">
  <property name="text">
  <string>Next</string>
  </property>
  + <property name="shortcut">
  + <string>Right</string>
  + </property>
  </action>
  <action name="actionBack">
  <property name="text">
  <string>Back</string>
  </property>
  + <property name="shortcut">
  + <string>Left</string>
  + </property>
  </action>
  <action name="action_Exit">
  <property name="text">
  <property name="text">
  <string>&amp;Open</string>
  </property>
  + <property name="shortcut">
  + <string>Ctrl+O</string>
  + </property>
  </action>
  <action name="action_Save_as">
  <property name="text">
  <string>&amp;Save as...</string>
  </property>
  + <property name="shortcut">
  + <string>Ctrl+S</string>
  + </property>
  </action>
  <action name="action_Print">
  <property name="text">
  <string>&amp;Print</string>
  </property>
  + <property name="shortcut">
  + <string>Ctrl+P</string>
  + </property>
  </action>
  <action name="actionZoom_In">
  <property name="text">
  <string>Zoom &amp;In</string>
  </property>
  + <property name="shortcut">
  + <string>Ctrl++</string>
  + </property>
  </action>
  <action name="actionZoom_Out">
  <property name="text">
  <string>Zoom &amp;Out</string>
  </property>
  + <property name="shortcut">
  + <string>Ctrl+-</string>
  + </property>
  </action>
  <action name="action_Normal_Zoom">
  <property name="text">
  <string>&amp;Normal Zoom</string>
  </property>
  + <property name="shortcut">
  + <string>Ctrl+0</string>
  + </property>
  </action>
  <action name="action_Fit_to_windows">
  <property name="text">
  <property name="toolTip">
  <string>Fit to Windows</string>
  </property>
  + <property name="shortcut">
  + <string>F</string>
  + </property>
  </action>
  <action name="action_About">
  <property name="text">
  <property name="toolTip">
  <string>First image</string>
  </property>
  + <property name="shortcut">
  + <string>Home</string>
  + </property>
  </action>
  <action name="actionLast">
  <property name="text">
  <property name="toolTip">
  <string>Last image</string>
  </property>
  + <property name="shortcut">
  + <string>End</string>
  + </property>
  </action>
  </widget>
  <customwidgets>
  