Kalle, look inside the directory skin.AeonMQ-2, you'll find a folder called language, if you have time and can translate the strings for German, send me the translated file that we launched together.
Look attached file is incomplete, you have to take English, copy the file to a directory Germany, and translate each string.
to change the language XBMC - go to settings, appearance, language is the second option
Kalle, the skin is the update automatically, you need not do anything to receive the new files. During the upgrade you should not quit xbmc,
wait until the end, you will receive on-screen visual report when the procedure is finished.