Add automatic translation by pressing send in chat
To facilitate the communication of people who like streamers from other countries, it would be totally innovative if it had an automatic translation of what was sent in the chat by the user in the language of the streamer, and also automatic subtitles capturing the live audio from the stream, improving usability of deaf people too.
Some Extension developers have created realtime chat translation and closed caption services already!
I would recommend Chat Translator, which translates chat into the language of your choice. Here's a video explaining it: https://www.youtube.com/watch?v=Qw66YsE1RnE. And where a broadcaster can install it:
For traditional closed captions, you can find Extensions that do this at the following URL: https://dashboard.twitch.tv/extensions/search?q=closed%20captions