Translation:We heard noise
I can see why they wouldn't accept it, since in English 'a noise' can mean a single sound, no matter how loud it is. 'Kelele' is straight up noise
It now accepts "We heard a noise" (22 July 2018).
To me, that sounds right. (A noise would have to be loud, and it could continue for some time, e.g. a road drill.) But I agree that it could also be a single (loud) sound.