Hi Gerd!
I'm rather new to fedora, but like working with it very much. Since I'm much
addicted to open source software I also want to contribute (at least
some
translations to German) to this project.
Welcome!
To know more about German translation team please find the maintainer and
mailing list at
http://fedoraproject.org/wiki/L10N/Teams. I think Fabian is
the current Maintainer of German Team, he will surely guide you through.
Translation Quick start guide will give you a brief explanation about how to
get started with the translations:
http://docs.fedoraproject.org/translation-quick-start-guide/en_US/
hth
Shanky