
Mediawiki recognizes underscores as spaces in usernames; basically, you're username is untranslatable to the wiki since your username has an underscore but it can't actually read underscores. I have the same problem. I don't know if whoever runs the wiki is still active, but they have to manually change some code to get it to recognize underscores. In the meantime, you can do what I did and make a second username just for the wiki.