If I remember correctly, the Dwarven race's use in the Final Fantasy Franchise has usually been either that of great racial pride and their propensity for gem and metal work. They are usually great builders. I don't remember ever seeing any kind of derogatory language used against them unless it was by/from Elves (since they tend to not like each other in some games ... thank you Tolkien). I don't think you will have anything to worry about, if there is any kind of language used I feel it would be used by them for them in more of a teasing manner and not as a way to be malicious.