All the text from the game is neatly packed into the English.str file (located in the String folder in your install), so everything you'd need to translate is in there!
It's not complicated at all, just open it with notepad

The basic format of the file is:
StringInfo
ID
Value
ID is what the game uses to know what to display, the value is the actual text, and what you can change to whatever you like.
Hope this helps!