I understand from reading the questions and answers that you folks have a lot of requests for other languages on your hands. I've commented elsewhere that I'd like to see Irish added as one of those languages, and that I actually have a lot of contacts that could make that happen. Obviously you've got a lot to do, and other languages are ahead of Irish in line, but if you could, would it be possible to briefly detail what kind of data is needed to start with a new language? I intend to do a presentation or paper on your system for a Celtic language-speaking audience, and it would help to understand what would be required if our languages were to be added to Duolingo.
Keep up the good work, by the way! Love the site.