[LyX/2.3.x] Update fr.po

[jpc]

commit 7c8e7cef739c0d4f04bb0be80a6fd47208c83a73
Author: jpc <jpc at lyx.org>
Date:   Mon Mar 29 10:38:56 2021 +0200

              Update fr.po

 po/fr.gmo |  Bin 550525 -> 550566 bytes
 po/fr.po  |  768 ++++++++++++++++++++++++++++++------------------------------
 2 files changed, 384 insertions(+), 384 deletions(-)