[LyX/master] Update fr.po

[jpc]

commit 2eab3d2e06bdabfe27c683b591a54acfa631629a
Author: jpc <jpc at lyx.org>
Date:   Tue Mar 2 11:16:41 2021 +0100

                Update fr.po

 po/fr.gmo |  Bin 614535 -> 620505 bytes
 po/fr.po  | 3794 ++++++++++++++++++++++++++++++++-----------------------------
 2 files changed, 1969 insertions(+), 1825 deletions(-)