Anything which develops conceptual thinking, empathy and creativity such as Animal Empathy/Telepathy and Induce Creativity may help understand the concepts behind the language: the culture, context, and tone and getting a feeling for the cadence and structure. There is a lot of soul, context and many concepts behind languages, beyond the words, as Dream says in his language video. Learning languages is sort of like learning an art or a culture, in a way.
Superhuman Genius, Permanent Brain Enhancement and some of the other brain enhancement audios should help with fast reading and understanding complicated books.
I would probably use Animal Empathy/Telepathy, Childlike Wonder, Induce Creativity and the Crown & 3rd Eye Chakra audios along with those for learning languages. Perhaps even experiment with the crystal audios and albums because they could help you approach learning new languages with different perspectives and flexibility.
In addition to gpo’s great suggestions, the Crystal Kingdom 2 album may help with imagination too. Crystal Kingdom 2 has many tracks which harmonise all the chakras with the higher chakras or encourage spiritual growth in those (third eye, crown and transpersonal chakras). So, many of the tracks in that album should help with clear imagination.