hey horst,
you're welcome
I already did some checks on the current file structure and there is a reserved "you" string especially for the likes: COM_EASYSOCIAL_LIKES_YOU
that's part1 of the good news, part2 is that on transifex this is already correctly available now so with the next translation update from the stackideas team you can grab the new one's directly from your easysocial backend.
however, now we also have some bad news - would be too easy without^^ the reserved string is currently not used at all, so even with the corrected language file it will have no effect. the current "Du" for the likes is coming from this string: COM_EASYSOCIAL_YOU (if you want to modify it) instead of the one I mentioned earlier. but I guess as soon as mark or someone else from the team will read this they'll fix that for the next version
if you have some other questions or probs with german files, no matter which stackideas product, feel free to drop me a line at skype: joomlaplayground