I support the idea, but:
Please no nerd languages!!(*) Fully implementing, hosting, and maintaining them would still cause costs we all would have to pay for. I would rather use the money on improving the system itself.
I would very much like to see smaller languages here, even dialects, because LingQ’s unique structure could allow it to become a sanctuary for languages on the brink of extinction.
*I am not talking about artificial languages of general interest like Esperanto. These are very useful even if they are not as successful as they could be. But Klingon etc will never play a major role outside the scene they are coming from. Apart from the fact that you need Klingon anatomy to speak it like a native 