I've discovered that the guys from Userlike integrated DeepL to translate chats live during a conversation. The way it works is that it detects the webvisitors language and then translates it into the language that is set in the agents profile. You can see the feature in action in this short video (at 3:50).
How awesome would it be to have a similar feature for posts in flarum? It would make a whole forum be available in many more languages and bring together people from all over the world more easily!
For those of you who don't know DeepL yet: It is the current market leader in translation software, far better than any other software out there. It creates such great results, that it allows you to actually have a conversation with someone whos language you can't speak.
The technical documentation can be found here, hopefully someone feels inspired to build such an extension :-)