I think that the French song "le gabier noir" is a version or translation of an english-language song/shanty.
The chorus goes:
"Dix cents et demi, C'est la paye du noir
La paye du blanc, C'est un dollar"

roughly:
"ten and a half cents is the pay of a black
The pay of a white is one dollar"

does anyone know which english-language song this is please?