I was surprised with that because I'd guess the word wasn't used at all. But I see now, the word "fucker" is used once when it comes to those radical demodwarves. I don't know man, based on the perspective, there are many "inappropriate" and brutal things when it comes to the dwarves and life, in this and many other fantasy universes, so a basic primal swear word like that does not strike me as particularly inappropriate.