So, I won, but the problem is...

ONLY available in Germany. That means only people in Germany have access to the game in german. Every other player will get all languages except german. I could be wrong though.

hmmm good question... dont accept it or accept it and dont touch it... but i could swear you get the uncut version... if not write steam support they should delete it from your library... now you guys understand why we germans hate this racism from steam... and also hate german politics...

tell the gifter to ask for re-roll, and add a description next time..

accept it and send a ticket to steam support. they'll change it to your region.

It's only put there as a notice. If you go to the Steam store it says that for the other version as well. Nothing to worry about.

I'm actually in a bit of same situation. The game being FlatOut: Ultimate Carnage, which I only noticed being the German version after I started the game for the first time. The game has probably the most ridiculous censoring ever as the drivers are replaced by crash test dummys, when they fly out of the car. The game is only in German and has the language changing option greyed out.

I contacted Steam Support about the issue and the only thing they offered was removing the game from library and returning it to my inventory. If I were to do that, I'd give the game back to the giveaway creator for rerolling.

Why does nobody want to learn German nowadays?
Also: Ask Steam support to change it into your version.

don't think it's the language, but the Censoring is outta control and I truly feel bad for gamers and developer's alike from that region.!

I'd accept the gift and thank the giver, and say that you're going to try get Steam support to fix the region for you (so that he doesn't panic if you don't activate it immediately - you have a week to do so but it's often suspicious if one accepts a gift and doesn't activate right away). Then leave the game in your inventory and contact Steam support immediately. Ask them nicely if they can change the region for you. I imagine they'll say that they can and ask you to activate it first (but keep in in your inventory until they ask you to activate it in case they refuse to help, so that you have the option of giving it back to the contributor and asking for a reroll as a last resort).

Accept the gift and activate it.

It is only against the rules to give away games that can only be activated in certain regions (Polish RO, SEA Dota 2, etc.).

The giveaway breaks the rules in no way. You can contact steam support after activating the gift to get it switched to your region. They will NOT change the gift if it's sitting in your inventory.