Board Thread:Support Requests - Getting Technical/@comment-25138963-20140704141158/@comment-1038387-20140704150241

Google Translate:

"I have accidentally created an English wiki and would like to know if you can change that. I would in fact prefer a German wiki created, you can change the language somewhere?

Would appreciate help :)"

I'm not sure if this falls under the normal rename procedure, but try Special:Contact/wiki-name-change. If they can't help you, they can at least tell you what to do.