Thread:Extension talk:Babel/Problem with local categories

I'm currently taking care of merging categories on Wikidata, in order to reduce the isolation of "minor" wiki-projects with "major" ones, and of course I'm merging mostly user categories. I'm noticing that some versions have two versions of the same category: a localised one (like os:Категори:Архайджытæ os-0) and a non-localised one (like os:Категори:User os-0). I'd like to fix this problem by indicating the correct category, whenever I notice there's a mistake. How can I do it?