In this specific case, the tagging works out a lot like "sections" anyhow - I do believe that most of the questions are language-specific, and that if you go browse the tags, most of the ones with a lot of questions are language tags.

The tags-as-sections thing breaks down when you get a little more abstract than "x language", as the tags used will be ambiguous (people can retag stuff though, so that's something of a moderation system).