[language] Add Chinese to AI Translate options

Given Chinese is one of the most commonly used language, it would be highly beneficial to us (and any other companies with a China presence) to also include Chinese as an option under Compose with AI's "Translate" function.

Of all the languages available, currently only 2 are Asian languages (Japanese and Korean) - we would also appreciate expanding this function to others, such as Thai, Viet, Bahasa, etc.