[LyX/2.3.x] fr.po update for 2.3.5

[jpc]

commit 52bed14d8e6a832d70957c2a3a69e31566d962a7
Author: jpc <jpc at lyx.org>
Date:   Thu May 21 15:50:15 2020 +0200

    fr.po update for 2.3.5

 po/fr.gmo |  Bin 550364 -> 551827 bytes
 po/fr.po  |  757 ++++++++++++++++++++++++++++++++++---------------------------
 2 files changed, 419 insertions(+), 338 deletions(-)