Yep, that's us being stupid in the way we attempt to convert your unicode characters to plain ascii. I had a look and we simply swallow every non-ascii character, meaning that only a dot remains and your repo URL would effectively become /snnwolf/. which is not a valid URL.
I've raised an internal issue to address this, but in the mean time I'm afraid you'll just have to use plain ascii.
Erik van Zijst
FYI: I have deleted the rep for you, so you create another.
Issue #7181 was marked as a duplicate of this issue.