https://www.theverge.com/2019/1/8/18170806/google-assistant-translate-languages-real-time-interpreter-ces-2019

Google Assistant will soon be able to act as your real-life translator in 27 different languages. Google announced today that the voice assistant is getting a new “interpreter mode” that can translate in real time so you can hold conversations with someone who doesn’t share the same tongue. It works, but it’s not magic.

You’ll be able to say things like, “Hey, Google, help me speak French,” or “Hey, Google, be my French interpreter,” and Google Assistant will show text across a smart display that translates your words as you speak. Afterward, it will open the microphone for the second person to be able to speak in their language and words will be translated across the screen at the same time. Google Assistant also plays back the words in your native tongue.