The capital of Georgia is Tbilisi. Atlanta is the capital of the state of Georgia in the USA. You should make it clear that you're asking about the capital of the US state of Georgia.
I expected that! The clues are in German, after all. In that language, the independent country of Georgia is named Georgien. Of course, you won't know that if you're not a native speaker but that's the point here. And I don't think it makes the quiz harder.