use separators and number formats as in [it-IT], tdf#91199 follow-up

Can't use ref="it_IT" because it-IT is one of the legacy locales that
has localized format codes, sigh..

(cherry picked from commit c6e69096)

add missing license header

(cherry picked from commit 326b2135)

f8503566d02b2e2de51acc21f33042b9cc23b059

Change-Id: I3ce88e80f17e626bc4fc4849795e2c9893261dc3
Reviewed-on: https://gerrit.libreoffice.org/19670Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
(cherry picked from commit 79e98696)