To Change the Content of the Login Screen Language Menu

By default the login server creates the login screen Language menu containing a list of all locales installed on the system. When the user selects a locale from the login screen language list, the login server will redisplay the login screen in the selected locale. When the user subsequently logs in, the login server will start a desktop session for the user in that locale.

You can specify your own list of languages by modifying the Dtlogin*languageList resource in Xconfig:

Dtlogin*languageList: En_US De_DE

The login server now displays only En_US and De_DE in the login screen Language menu.