I've been missing a "language" attribute for URLs for a while, as I'm frequently adding e.g. Danish reviews of release groups. This post is to discuss the feature and try to convince all the rest of you that it'd be nifty to have as well. Please chime in with questions and comments and suggestions!
Some use cases I see for this could be, once we actually launch a localised musicbrainz.org, to only show URLs based on locale (e.g., show English language links for English language locales).
This would also be something I'd want for MusicBottle - to only display links relevant for the language the person is browsing in (probably like "eng+mul+$sessionlanguage"). If a user is browsing in Danish, it's unlikely they want to read a review in Greek.