Arabic is the Main /Mother Language it was the Language of Adam and all the other Languages come from it , And the Modern sciences discover that nowadays (THE SCIENCE OF THE UNIVERSAL LINGUISTICS)) and proof that , and said also that every week a language get die and disappeared , or stop talking in it cause it become weak in its sounds , and discovered also that Arabic will still in the Earth till the Day of Judgment , and nowadays they save the Important researches in Arabic to keep it to the Future generations , And Also As God said about the Holy Quran that he preserved it '' Lo! We, even We, reveal the Reminder, and lo! We verily are its Guardian" 10:9 So we believe that nobody can exchange the Quran as it made with the most of the other Holy Books ,, Beside that Arabic Language , because the Quran written in ARABIC.

I believe that it is Lithuanian as it is related to Sanskrit. Google lithuanian language and see what you can find out.