There are various ideas on how to handle multilingual posts on Hive.
Some create separate accounts for content in separate language (I think that's a bad idea)
Separate posts while only main (native) language is set to recive rewards while others have declined payout + link to original one?
Tagging sections of post with different language tags might one of better options.
This could take into account user settings and display by default only preferred language.
Problem is that it would be a lot of hassle to implement it, while very limited use cases.
In many cases multi-language posts are of poor quality, because it doesn't happen frequently that poster gets help from professional translator. In the end, such translation is usually so bad, that's not better from auto-translation, and if so... why bother? ;-)
(I know, My English sucks)