Well, many original game is from Japan, in their language, which I can not read... Of course the big company will release some of them in other languages, not only the text, but the voice.
Last time I saw the patch for xxx(some game), which provides some files, and if you replace them in the original ISO, then make a new iso with VCDROMX, you can play the english version on psp perfectly. (some of the texts were not translated, such as the names)
Yeah, it is quite good for a RPG game. Just wondering how to do it? if it is possible, maybe i can do it myself.