Peace Brother Muslims,
The Quran was ofcourse descended in Arabic (native)language on our prophet/messenger Mohammad. Please note that according to Ayats
4458 - We have thus made it easy in your language, perhaps they may take heed.
144 - And We have not sent any messenger except in the language of his people, so he may clarify for them. But God misguides whom He wills, and He guides whom He wills. And He is the Noble, the Wise
16103 - And We are aware that they say "A human being is teaching him." The tongue of the one they refer to is foreign, while this is a clear Arabic tongue.
Suppose if Prophet Mohammad was born in France, then the Quran would have descened in French (native language of Prophet Mohammad to warn people going astray or to assure heaven for people who do good deeds).
Language is not important. But the MESSAGE is.
Sabina