Subtitles are only available for a few languages, and Italian is not one of them.

Worse yet, even if someone translates the English subtitle file and adds it to the Italian text set, it still won't work as the subtitle system is restricted to work only with the languages that have stock subtitles available, and it appears to be compiled into the .exe so the stock system can't be modified to make it work for additional languages.

It should be possible to recreate its behaviour for the unsupported languages by coding a similar system in Lua and hooking it up to the game's own script base. We have done something similar for the original version of all three games to add or extend subtitle functionality back in the day, and the Lua codebase for the EE versions appear to be very similar to likely make this approach still viable.

A simpler approach is to replace the text set of one of the subtitle-enabled languages (even English itself if you don't mind losing that as a fallback option) with the Italian content after the subtitle file has been added to it and translated.

Same for spanish. plus the tranlation is wrong, some tranlate ceiling (techo, cieloraso, entretecho) with cellar (sotano, bodega), the first word refer to a place on the top of a house and the other to the botom, so some indications miss leading to search stashes in places that not exist.

nn capisco la tua esigenza e tra l'altro abbiamo la fortuna che i dialoghi in background sono rimasti incensurati.forse è veramente meglio giocarselo in italiano sto giro;).