I've tried changing the man pages on debian from English to Italian but all I have tried hasn't worked yet.
First of all, I installed the manpages in Italian with
apt install manpages-it.
I then edited the
/etc/locale.gen file and uncommented it_IT.utf8, then ran
locale-gen to update it. After that I tried with:
man -Lit printf man --locale=it printf LANG=it_IT.utf8
but none give me the manual pages in Italian.
The only manual page in Italian I can get is
man man, but the other manuals are just in English.