How to add languages to a game from a different version

Hi, I managed to get Spider-Man 2 working fine (I found out that the problem is the APR-Emu, the game doesn't run with the latest version, but only with the previous one)

The problem is that it only has the US version languages, and my GF doesn't understand English, so I wanted to add the Italian language to the game, since the "USA to EU" version doesn't even get to the main menu.

How can I add the additional language (like they did with the other version) without touching anything else?