No. No, it most definitely is not idiot-proof. Hextator’s opinions are, shall we say, not widely-appreciated in this community.
Now, as to fixing your problem. If you’re bound and determined to use it, try opening your rom in Feditor, save it, and close it. Then reopen and do your text edits. Usually, that makes things not break as much.
If you’re trying to do a hack (or at least, something more than just changing a few bits of text here and there), it might be worth looking into this. Yes, it takes a bit more time and effort to get used to, but it’s less likely to do whatever caused your issue.