message: Setting mnemonic text alignment center
diff: <layout class="QVBoxLayout" name="horizontalLayout">
  <item>
  <widget class="QLabel" name="mnemonic">
  + <property name="alignment">
  + <enum>Qt::AlignCenter</enum>
  + </property>
  <property name="minimumSize">
  <size>
  <width>500</width>
  