The Babel template includes a link to
However, such category is empty -- click the link at the bottom of the Babel box at http://espiral.org/wiki/User:QuimGil
A category page with links to the main category of each language would be expected instead.
For what is worth I can see a couple of diferences between my stock installation and what meta.wikimedia.org and mediawiki.org have:
- these sites point both to https://meta.wikimedia.org/wiki/Category:Users_by_language
- their user language categories have the format "User xx" while in my installation the categories are created with the format "Xx".