Yes, it matters. So much.
First, the English language is understood only by a minority in the world. The largest portion of the world's population does not understand English. So there is a need to translate Bitcoin's whitepaper to as many languages as possible.
Second, the document brings so much to the world, why would others be deprived of it? Although it doesn't really matter to a lot of people who are still living in ways far from the reach of technologies, still it preaches a lot of what the financial system should be like. And time will come technology will reach them. It is better to have already formed a rough idea of how a monetary system should be.
At least as of a few years ago English was the most known language in the world. Chineese was a distant 2nd and Hindi 3rd.
I don't know if it's changed in the last few years but I can't see it loosing it's spot that quickly.
It might not be the most known NATIVELY but it's known.
The catch is that it's a very popular 2nd language.
BUT, no matter what the more languages the white paper is in the better it is. More eyes on it the better it is.
As for @pooya87 and why so many "third world under developed countries like Nepal, Bangladesh, etc. are always against bitcoin" I can ask " why only third world under developed countries like El Salvador are the ones fully Bitcoin" Yes, they tend to be against it more then for it, but they are still there.
-Dave