Well, there is quite a lot of changes that I have made in my module, regarding all sorts of things - spells, feats, skills...
I figured that if I let players know how all this stuff works now from in-game descriptions and not only from some external documentation file, it would be nice.
But is it possible to have a module-specific dialog.tlk? Obviously, I wouldn't want these descriptions to be incorrect when playing a different (unmodified) module. And I don't want players to replace their dialog.tlk file whenever they decide to switch from my module to another one or vice versa.