Which of the games you are referring to, and to which language you wish to translate this game?
It's worth to mention that, for the DS versions, there's already official translations of the first three Phoenix Wright games for various languages besides english, such as spanish, french, german and italian. So, if you're wishing to translate it to, let's say, french, then there's no need to do so.
But if you're referring to other PW games that haven't got official translations to other languages besides english, such as Ace Attorney Investigations series per example, there's already some guys working on it
If you're trying to translate it to other language besides the ones I've mentioned, then I got a few hints to you:
- If you're using PWSE to edit texts, then it won't work. You'll get in-game crashes sooner or later;
- Some graphics are uncompressed, and can be viewed simply by opening the rom in any Tile Editor, by using 4bpp linear / 8bpp codecs, and switching between 1 or 2 dimensional modes;
- Most graphics are compressed in LZSS, and you won't be able to see them in Tile Editors. You'll have to use other tools, such as LazyDS or LZSSRestructor 2
And last but not least: good luck. You'll need it, because hacking this game entirely is a very hard task.