I'm sorry? What?
There was nothing wrong with the translation from when I played Nehrim. One or two books in the gameworld still only in German and some decorative details here or there, but for the most part and for the type of project that it is - it's really solid piece of work and one that I really enjoyed playing.
That said, I'm sure some our more pedantic native German speakers are more likely to find more specific issues with the translation than I could.