This mission was made in the Polish language.
It's unlikely that I'll translate this one. You can find the English description below though.

[PL]
W jednym z lokali Inside Track z okazji pewnej promocji zostala dostarczona duza suma pieniedzy. Ben oraz Troy majacy dlug u jednego z bardziej wplywowych mieszkancow Los Santos maja za zadanie okrasc wspomniany lokal. Ta robota jest ostatnia rzecza dzielaca ich od splacenia dlugu.

[ENG]
Due to a certain promotion, there was a delivery of a huge amount of money to one of the Inside Tracks spots. Ban and Troy, who are in dept to one of the more influential Los Santos citizens, are given a task of robbing the place. This job is their last obstacle on their road to paying off said dept.