What is the Latin translation for 'pride in your work'?

"Pride" is superbia, with the source of pride in the genitive; thus "pride in your work" is superbia operis tui(or operis vestri if "you" is plural). The verb "to take pride" is superbiare, with the source of pride in the ablative; thus "to take pride in your work" is superibiare opere tuo (or opere vestro).

If a specific reference to the person(s) spoken to is not intended, then possibly superbia operis sui; superbiare opere suo "[to take] pride in one's own work" is a better translation.