Fix show "switch_application_language"

bug found by David which informs me that it was changed
in kxmlgui a957f121882469596330f2afb25e95c9943b1c34
As we use "no-merge" it will not show.
=> necessary to add this entry here

src/kmail_part.rc

@@ -2,7 +2,7 @@
      the same menu entries at the same place in KMail and Kontact  -->
 
 <!DOCTYPE gui>
-<gui version="545" name="kmmainwin" translationDomain="kmail">
+<gui version="546" name="kmmainwin" translationDomain="kmail">
  <MenuBar>
   <Menu noMerge="1" name="file" >
    <text>&amp;File</text>
@@ -222,6 +222,7 @@
    <Separator/>
    <Action name="tools_automatic_archiving"/>
    <Separator/>
+   <Action name="switch_application_language" group="settings_configure"/>
    <Action name="options_configure_keybinding" group="settings_configure"/>
    <Action name="kmail_configure_notifications" group="settings_configure"/>
    <Action name="options_configure_toolbars" group="settings_configure" />

src/kmmainwin.rc

@@ -2,7 +2,7 @@
      the same menu entries at the same place in KMail and Kontact  -->
 
 <!DOCTYPE gui>
-<gui version="545" name="kmmainwin" translationDomain="kmail">
+<gui version="546" name="kmmainwin" translationDomain="kmail">
  <MenuBar>
   <Menu noMerge="1" name="file" >
    <text>&amp;File</text>
@@ -222,6 +222,7 @@
    <Separator/>
    <Action name="tools_automatic_archiving"/>
    <Separator/>
+   <Action name="switch_application_language" group="settings_configure"/>
    <Action name="options_configure_keybinding" group="settings_configure"/>
    <Action name="kmail_configure_notifications" group="settings_configure"/>
    <Action name="options_configure_toolbars" group="settings_configure" />

src/kmreadermainwin.rc

@@ -1,5 +1,5 @@
 <!DOCTYPE gui>
-<gui version="530" name="kmreadermainwin" translationDomain="kmail">
+<gui version="531" name="kmreadermainwin" translationDomain="kmail">
  <MenuBar>
   <Menu noMerge="1" name="file" >
    <text>&amp;File</text>
@@ -76,6 +76,7 @@
    <Merge name="StandardToolBarMenuHandler"/>
    <Action name="options_show_menubar" group="settings_configure" />
    <Separator/>
+   <Action name="switch_application_language" group="settings_configure"/>
    <Action name="options_configure_keybinding" group="settings_configure"/>
    <Action name="options_configure_toolbars" group="settings_configure" />
    <Action name="kmail_configure_kmail" group="settings_configure"/>