if it not broken, do not fix it
Definition:  if something is working fine, do not change it unnecessarily
Usage:  Johnson thought that his car had a radiator problem and wanted to change it, the mechanic told him if it is not broke, do not fix it

SEPEDI
Translation:  ge e se ya robega, o se e lokiše
Proverb: tlhaka ya go dutla e lokišwa mohla wa dipula

XITSONGA
Translation:  loko xi nga tshovekangi u nga xi lunghisi
Proverb: ku tshunguriwa loyi a vabyaka

TSHIVENḒA
Translation:  arali tshi songo tshinyala, u songo tshi lugisa
Proverb: hu si na dunzi, tshikwama tshi songo putululwa