Weird/non-standard translation? So they claim all communications were in Mandarin?
I took that to mean English was the spoken language, it was originally written up in Mandarin, and then translated back to English.
No, I don't know why. LiveATC.com actually has a recording of some of the KL ATC freq that night. What little I heard of MAS370 was in English.
No one is going to use the callsign "MH370" on freq (which isn't the flight's actual callsign, anyway). But at least we have times/rough intent of the transmission. Looks completely normal to me, even the second confirmation of climbing to FL350.