I do not think that deep learning can be applied to learning languages. It is based on an algorithm. Language and speech are too complex to be learned in such a way. I am studying a few foreign languages and cannot imagine how that can be possible. For example, machine translation cannot beat human one. I have tried to translate a few things with the help of online machine translators, but still had to contact https://www.translateshark.com/spanish.html to make a proper translation.