Why do our HCs and SC still function only in English?

English is not a mother tongue for many Indians. If you didn't study in super good school, chances are that your English understanding skills are limited. Justice shouldn't be accessible based on language, and that too a non native one. Why do our High courts and SC function only in English? Why haven't we fixed this Himalayan blunder yet? In many European countries, supreme court's function in more than one native language. Practically it is possible.