Wikimedia

Because you translate messages that are part of the MediaWiki software. It also puts you into a category so that it is possible for people to address people who work on MediaWiki messages.

Okay, thank GerardM

Thank you GerardM for adding babel to my user page via the new mw:Extension:Babel. For backward compatibility, would it make sense to have a Template:Babel wrapper for it? Thanks again!