Currently there is no fixed team of German translators. If you want to start translating to German (which would be really appreciated, by the way!) there are some pointers:

Glossaries used by the German translation team

We try to follow the GNOME Guidelines and their glossaries:

As well as the Transifex glossary of the Torproject (you need to be logged in with Transifex to see this page):

For words not in these lists it is helpful to see how they are translated (or not translated) in Wikipedia.

Often, we simply discuss on the mailing list for translators if unsure which term applies best.