same curious bout it too..from my experience it technically doesnt have too but i still prompt everything in the language I want it to speak..just prevent any instances where it starts speaking in english because it see that I gave it instructions or dialogue in english. Might of well reduce the chances of AI outputting something in a different language. There are also certain things that are just said completely different then how they are said in english like @ in the emails and need add how someone might say it in that language so AI can accurately decipher it