I think multi -language forums with AI translators is a cool idea.
You post in your own language, and the site builds a translation for everyone, but they can also see your original etc.
I think building it as a forum feature rather than a browser feature is maybe worth.
That's Twitter currently, in a way. I've seen and had short conversations in which each person speaks their own language and trusts the other to use the built-in translation feature.
You know that this is the most hated feature of reddit ? (because the translations are shitty so maybe that can be improved)