[LyX/2.3.x] Update it.po

[Enrico Forestieri]

commit 0984e113171297e402c88ce048e9ccf1fb3d3619
Author: Enrico Forestieri <for...@lyx.org>
Date:   Sat Jan 20 11:32:54 2018 +0100

    Update it.po

 po/it.gmo |  Bin 530313 -> 530815 bytes
 po/it.po  | 1242 ++++++++++++++++++++++++++++---------------------------------
 2 files changed, 562 insertions(+), 680 deletions(-)