I found out why it didn't build: a numeric code in the first lines was in a wrong format.
But now i need help to know what exactly i need to put there, because i don't know anymore.
The lines are these (example got from french file):

LanguageNames=(FRA=0x0c:winerr)
CodePages=(FRA=65001:0)

The problem is only the hexadecimal code in the first line: where i find the right value for ITA?
The one i put (incorrectly) was from ita.nls ...