One who is truly seeking to know does not care about the language in which the truth is packaged. Majority of Indians do not understand Sanskrit, yet those who are keen to learn take care to learn the language because the sacred scriptures of the Hindus are in that language. Whether we like it or not English has become by default an international language. Besides do we want truth to be limited only to those who know a particular language?
As to pollution, no language in the world is polluted as such. It is the usage of people that pollutes it. Look at the filthy words, abuses used in most languages including Hindi and English. That is what pollution is. We should not pass on our limitation in learning a language to the truths that are being revealed. India has always been a worshipper of Truth that has accepted its expression in countless ways. Let us not reduce it to our petty language divide.
I agree we should not absorb the bad things from outside but these bad things do not come through language. They are packaged in every language, Hindi Bollywood cinema and the Tamil cinema and every cinema for example. Like Truth, falsehood and evil use any and every language as their instrument. Let us develop true discernment and not squabble over the packages.