Honest question, how? If this is a side project so you're presumably the person making the courses, and you didn't speak Turkish before, how did you make a course that taught yourself Turkish?
> We work together with some institutes of endangered languages to be able to teach them on our platform.
I assume this is how? Are you a platform for these institutions to provide Duolingo-style language courses? Can you possibly provide more details on who these orgs are?