i am from Germany and i truly LOVE the Idea of Grimrock. I am 38 years old and played Eye of the beholder and all the legendary games years ago. But i dont like to play games in a different language now, so i prefere german translated products. My shool was years ago and as you see translation and understanding is hard for me and not funny, this make a wonderful gameplay to a mess and riddles sometimes unsolvable. If you have plans for a second Part of the game i would pay the double price if it is fully translated into german.
Maybe the community would help you to translate this Version if you just give them the chance (ich meine nicht das Manual, sondern das Spiel selbst und die Texte im Spiel) and with Steam you could sell it as DLC or just as free patch. I think you could get a lot more german customers not just a few german Roleplayer
LG Thomas
CU TWG