Update "Translating:MediaWiki/Credits" page

Anyone can update the page: it's not hard, just tedious. After extracting the names in the metadata, you need to clean it up manually. Help finishing the cleanup of this update would be appreciated.

Thanks very much for updating it! Since page is (reasonably) protected I'd appreciate if you remove "Railfail536" entry: it's my previous nickname and redirects to "User:Rail" either way.