This would enable Dreamwidth's ability to do things like let you choose which languages you want to read on the latest entries page, if I grok correctly? I would like that, definitely - it would make it easier for me to find people who write journal entries in French, Korean, etc.

(Tangent: I would still want /latest/ to display all entries in all languages; if I wanted to see only entries in French, I could bookmark something like /latest/?lang=fr to see all the French entries. Or maybe even ?lang=fr,ko,en for multiple languages? But I like seeing the linguistic variety on /latest/; it's a good demonstration that DW isn't just for one particular niche.)

Back to the original suggestion:

- Language tags should constitute a separate entry area from regular tags.
- An entry can contain multiple languages, so tagging an entry with multiple languages should be part of this feature.
- I'd like to be able to set a default language tag going forward; I will write predominantly in English, and I wouldn't want to have to remember to add the language tag every time. I'm already bad enough at consistently using regular tags >_>
- Going backwards, it would be awesome to retroactively apply a language tag as part of the mass-entry-editor, even if this had to be a paid-only or time-delayed feature.
- Synonym-bundling of language tags, yes, absolutely, especially across languages.