which is the file to edit the script to translate in Italian?
Okay,
I forgot to mention that with OSSN 1.8 only 4/5 of the Enlish language strings are translatable this way - the remaining stuff is still part of the code, and you would have to grep through a lot of modules manually. That said, it may be the better decision to wait for the stable 2.0 release where everything will be in the right place.
There's already a guide on how to implement Indonesian at
http://community.opensource-socialnetwork.org/discussion/view/60/Multilanguage
The identifier of Italien is "it" - simply change every occurance of "id" to "it" accordingly.
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