As the first available additional language for Community Server 2.0 - I’ve now installed the German translation as an alternative to English.
You can go into your profile and in the “About” tab select the language. Click save, and then you soon will see most texts in German instead of English. I say most, as it really is not yet all. Hopefully a better version comes soon.
And of cause also notice that only the fixed texts of the site is translated. Not any of the posts etc.
But if you really just want everything to be German, then the only place to go is the German forum.