MediaWiki:Babel-autocreate-text-levels
Wrong namespace.
Template:Category User iso-n is for use only on category pages whose title is of the form "Category:User iso-n", where "iso" is an ISO 639-1 or ISO 639-2 language code such as fr
or nav
and "n" is the digits 1-5
or N
indicating the level of proficiency at that language per Wikipedia:Babel.