Hi Axel,
Are you seeing this in ComicBase or Sidekick? Neither should have any German resources in the current build (there were placeholder resources, but they're excluded from the main project since they haven't been through human translation--is it possible you're somehow seeing these?). In any case, try re-downloading the software and let me know if you still have the problem by writing us directly at support@comicbase.com and letting us know your exact version, edition, and language settings.
-Pete