[Owncloud] please fix German translation

[Michael Göhler]

Hi Thomas,

> PS: may I ask you to file an issue on github the next time? THX

It's just because I read the "Translation is done via Transifex..."
comments all over this mailing-list.

Since I didn't know anything about Transifex and its bug-handling, I
thought it would be best to ask on the mailing-list before filling
the bug at the wrong site ;)

Becasue adding translation bugs to github can cause new contributors to
fix the translation in github instead of Transifex. And that's not what
we want.

What do you think?

Regards,
Michael