Strintly speaking a translation of the Koran/Qur'an is not a Koran/Qur'an - that term is reserved for the text in the original Arabic. Burning a translation is highly offensive, but it doesn't count as sacrilege, in the way burning a real Koran/Qur'an would be.

Many translations are actually diglotts, with the original text on one page and the English translation on the facing page.