do not make a mountain out of a molehill
Definition:  expressing a minor issue in a manner that makes it appear much bigger and more problematic than it actually is
Usage:  after I apologised for breaking Johannes’ pencil, someone made a mountain out of a molehill by reminding him that I lost his pencil case last year

SEPEDI
Translation:  o se ke wa dira gore seolwana e be thaba
Proverb: o se re go e bona e hlotša wa e nametša thaba

XITSONGA
Translation:  u nga endli xitshukana xi va ntshava
Proverb: xintshabyana xi hundzuke ntshava

TSHIVENḒA
Translation:  ni songo thavha u bva kha tshiulu
Proverb: ndi nguluvhe, i songo itwa nḓou