Isn't it better to make a "remove censorship" option in game like League of Legends has for example, then you can let people choose to have censorship applied to their text or not. Of course censorship would be ON by default.
This is the best solution. Or if you don't want to do this, can we just open up the file that censors words for user editing?
Let people (or parents) create their own list of things to censor. This is already possible if you hack the .wz file (or it used to be possible), but as editing those files is against ToS, it's not a valid option.