Locale date didn't work on my website

[bouqks]

Hello,

I'm currently using elementor datepicker localization on a local website.

I added this code on my functions.php :

add_filter( 'elementor/datepicker/format', function(){return ('l d F Y');} );
add_filter( 'elementor/datepicker/locale', function(){ return 'fr'; } );

Only format as "l d F Y" is working, but not the localisation, I want to have this date in french.
I don't know why this is not working..
(My site language is French)

Can someone help me ? :)