[LyX/2.3.x] Update it.po

[Enrico Forestieri]

commit 4790f1a728dce99939801073bf1999ca49dc12e0
Author: Enrico Forestieri <forenr at lyx.org>
Date:   Fri Sep 18 23:51:36 2020 +0200

    Update it.po

 po/it.gmo |  Bin 536176 -> 537660 bytes
 po/it.po  | 1302 +++++++++++++++++++++++++++----------------------------------
 2 files changed, 584 insertions(+), 718 deletions(-)