Hi.
Took a look at the wiki some time ago. You need to register to do anything on the wiki, top right hand corner I believe, says something like "anmelden". But, big but, if you could add to wiki, in what language? German is very difficult to translate into English and vice-versa.
If people would like a wiki (English version), unless someone wants to show differently, it would have to be built from square one. Which is a shame, because most of the questions you see being asked on the forum have already been asked and answered most likely on the German forum.
When I first played Nehrim a couple of months before the English version came out, it was how I managed to get through the game. Google translated what I could not follow and used google translate to find answers on the German forum.
So I guess it comes down to, is it easier and better to build and start an English wiki (then who is going to start it?) or find a way to translate the German wiki that would be suitable to accomadate both German and English speakers.