Hi,seeing the same problem here. As a workaround I put a script to export "LANGUAGE=" to it's correct value in ~/.kde/env/ as recommended in [1]. It works with kde terminal emulator like Konsole or Yakuake.
[1] http://userbase.kde.org/Session_Environment_Variables/en -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]

