[LyX/master] Update it.po

[Enrico Forestieri]

commit b9e8462bd874edb8724f50f9012a635288f9b7ca
Author: Enrico Forestieri <forenr at lyx.org>
Date:   Thu Mar 4 16:16:21 2021 +0100

    Update it.po

 po/it.gmo |  Bin 600672 -> 604323 bytes
 po/it.po  | 4513 ++++++++++++++++++++++++++++++++-----------------------------
 2 files changed, 2347 insertions(+), 2166 deletions(-)