a bad workman always blames his tools
Definition:  when a person fails to perform as expected, he blames others or the quality of their equipment but themselves
Usage:  he said they lost the game because the conditions were not favorable; I guess it is the case of a bad workman blaming his tools

SEPEDI
Translation:  mošomi wo mobe o phela a sola didirišwa tša gagwe
Proverb: pudi ge e šitwa go tswala e re mokaka ke o monnyane

XITSONGA
Translation:  mutirhi wa xitsandzeki u tshamela ku sola switirho swa  yena
Proverb: loko yi tsandzeka ku rima yi sola xikomu

TSHIVENḒA
Translation:  mushumi muvhi u dzulela u pomoka zwishumiswa zwawe
Proverb: ṋowa i tshi kundwa mbambeni i ri ndi nge ya dziṅwa milenzhe