Thank you for your posting, Mindiell.
Seems like forums won't join. In fact, I can really understand that. Having a board in the native language is often better because of people better understanding problems, questions and help. That's why I'd either join both ("same for everybody") or create an inofficial help board.
Personally I'm interested how many German guys are using SFML and if it would pay off to create a small help board(!) for these people. Of course this would result in another "split" of the community, but like the French people argue, it's the same for other languages: when there's a native speaking board, native speakers would always prefer it instead of an English one.