[LyX/master] Update fr.po

[JeanPierre]

commit 23986ffb524f9668f74d0452a2e015ec5e8d59c8
Author: JeanPierre <jpc at lyx.org>
Date:   Mon Jul 13 11:01:22 2026 +0200

           Update fr.po

 po/fr.gmo |  Bin 770653 -> 778266 bytes
 po/fr.po  | 3053 ++++++++++++++++++++++++++++++++++---------------------------
 2 files changed, 1720 insertions(+), 1333 deletions(-)