[LyX/2.3.x] Revert update of pt_BR.po (the update was meant to go to 2.4, not 2.3)

[Pavel Sanda]

commit 27ef57096cab460970539805cf3efd645e5db079
Author: Pavel Sanda <sanda at lyx.org>
Date:   Sat Apr 13 03:18:30 2024 +0200

    Revert update of pt_BR.po (the update was meant to go to 2.4, not 2.3)

 po/pt_BR.po | 28037 +++++++++++++++++++++++-----------------------------------
 1 file changed, 11292 insertions(+), 16745 deletions(-)