Hehehe...this topic makes me strangely amused.
My two cents: so I can somewhat sympathize with the OP, as I was raised in a somewhat conservative religious family, and still practice most of the values that come with it. Although frankly, I've come to not mind mind most swear words, especially words like "damn" and "bastard" that have a sort of rustic Old-English type charm to them, and I think are most at home in FFT-like scenarios that are based on gritty medieval wars. On the other hand, I respect people wanting to exercise a little judgment in how they use their language, and understand the need to be seen as not personally promoting something (such as swearing), even if that thing is prevalent in society. So I would classify this sort of thing as small change - nice to do if it's easy, but not a huge deal if you don't do it.
Regarding the graphical and storyline violence in this thread, my perspective is that FFT is a much darker game on paper than the actual game makes apparent due to the how much the cartoonish medium undermines the shock of that violence. Frankly, and oddly, the descriptions people are writing about FFT violence in this thread give me a much more graphic mental picture than the actual game graphics. Maybe it's the fact that all the characters look like cute chibi-teenagers, or the protagonist's own childlike nature, but I just can't perceive the events as very traumatic. So despite the "heavier" themes, I don't really see FFT as being "not for children" (within reason). There are a lot of classic fairy tales that have very dark themes, but are portrayed in such a way as to not be "too disturbing for children."
So really, the portrayal is huge - Game of Thrones, for example, while having many of the "dark themes" similar to FFT, portrays them in a much more graphic, believable, and grounded way than FFT, such that I would say GoT may not be for children. But I digress, and you are free to feel otherwise.
Anyway, to the original point, I actually don't know if there are any swears in Tactext (which is stupid easy to use, BTW, don't look for anything to get easier than that). Most of them would be in events, as has been mentioned. The good news is that you don't really have to learn the intricacies of "how to event" - basically, all you have to do is familiarize yourself with the tools, then find the encounters/text in question and change them. Once you know what you're doing, and if you remember where most of them are, I'm guessing you could knock this project out in half an hour.