Someone proposed using an “l” tag via NIP-12 but it’s by no means a standard. Moreover, it would depend on all clients to implement what you suggested, which isn’t going to happen. My current approach above avoids these issues and works pretty effectively, with minor performance cost on the client.
Discussion
Could you leave a note with a multilayered Language post and allow the client to select the filter . For the language they need or whatever?
What problem are you looking to have solved?
There are some people who are multilingual and might want to post in multiple languages for the same message. Nothing is stopping them from doing that today. Either in a single thread or as separate top-level posts.
Is it possible to have all the notes in your client translate . I’ve only been able to do them one at a time and I keep losing my place when I got back , lol, I’m sure I juts have to figure out the right way to do it