@mojala @Stoori You mean, the platform will translate the hashtags? Sadly, nope. At least I haven't seen a fediverse software that does that.
I think it is possible to do, as long as the link still points to the untranslated hashtag. But, I think it hasn't been done for two reasons: the usual (1) most are English speakers and multilingual support is usually not part of the objectives; and (2) it might cause confusion since technically a translated hashtag should be a separate hashtag.
I think one other solution is to introduce #SemanticHashtags, but I think that's going to be a real challenge.