I would be able to help with that as well, since I'm a native German speaker. I mean, only if you want the help, of course
I'm sorry I haven't been online in quite some time, but I'm really glad to see that we've found a lot of new sources in the meantime, because those will help us for sure. This is a really huge project, but I feel that we can do it, especially if we basically just take everything @Magni posted and put it in a Wikipedia format.