@thomas yes, that can also be a problem, though the default of copying the interface language at least helps a bit.
To be fair to multi-lingual posters the UI is not fantastic. It'd be nice if it could interface with some kind of language detection API, though a) I'm not sure if such things exist and b) if they're not shitty for privacy.
@thomas I would also love a server or user-level setting for "automatically attempt to translate if the language doesn't match my preferred language" so I don't have to click the "translate" button a billion times.