As far as I know -- nobody is doing the German translation yet. Unless Laufey knows differently. So, you probably should PM her and ask. 99% probability is that you are the first to volunteer.
I remember somebody asked me about it ages ago, but haven't heard anything since then so I have no idea if the person is working on it or has abandoned the project. Sadly, I've also lost their address, so can't ask.
I say wait a little while, and if nobody comes forward it seems safe to assume that you can work on it undisturbed.