It can take a moment to translate when enabled but it does work - a button on the right shows (a little icon) which you can click to show original, so you switch between it. I saw it yesterday when some moderator was speaking russian to a model, and it definitely worked. It may have been because the room had a lot going on (60,000 users + lots of bots/apps too) and thats why it took a little while to load the translation, but otherwise it was useful to have for sure