it is not over till the fat lady sings
Definition:  one should not presume to know the outcome of an event which is still in progress
Usage:  his lawyers made solid submissions and we concluded that no matter what, he will win the case; little did we know that it is not over till the fat lady sings

SEPEDI
Translation:  ga se gwa fela, go fihla kgarebe ye koto e opela
Proverb: dikgomo di retwa di bowa mokatong

XITSONGA
Translation:  a swi si fika emakumu ku fikela loko wansati wo nyuhela a yimbelela
Proverb: dzovo a ri tshuvutsiwi n’wana a nga se tswariwa

TSHIVENḒA
Translation:  a zwo ngo fhela u swika mufumakadzi o khwaṱhaho a tshi imba
Proverb: ḽi ḓo tsha hafhu matshelo