you need the js file from this page, (here it is below)
/* French initialisation for the jQuery UI date picker plugin. */
/* Written by Keith Wood (kbwood{at}iinet.com.au),
Stéphane Nahmani (sholby@sholby.net),
Stéphane Raimbault <stephane.raimbault@gmail.com> */
(function( factory ) {
if ( typeof define === "function" && define.amd ) {
// AMD. Register as an anonymous module.
define([ "../jquery.ui.datepicker" ], factory );
} else {
// Browser globals
factory( jQuery.datepicker );
}
}(function( datepicker ) {
datepicker.regional['fr'] = {
closeText: 'Fermer',
prevText: 'Précédent',
nextText: 'Suivant',
currentText: 'Aujourd\'hui',
monthNames: ['janvier', 'février', 'mars', 'avril', 'mai', 'juin',
'juillet', 'août', 'septembre', 'octobre', 'novembre', 'décembre'],
monthNamesShort: ['janv.', 'févr.', 'mars', 'avril', 'mai', 'juin',
'juil.', 'août', 'sept.', 'oct.', 'nov.', 'déc.'],
dayNames: ['dimanche', 'lundi', 'mardi', 'mercredi', 'jeudi', 'vendredi', 'samedi'],
dayNamesShort: ['dim.', 'lun.', 'mar.', 'mer.', 'jeu.', 'ven.', 'sam.'],
dayNamesMin: ['D','L','M','M','J','V','S'],
weekHeader: 'Sem.',
dateFormat: 'dd/mm/yy',
firstDay: 1,
isRTL: false,
showMonthAfterYear: false,
yearSuffix: ''};
datepicker.setDefaults(datepicker.regional['fr']);
return datepicker.regional['fr'];
}));
)
save this with your other js files, and reference it in the head section of your page.
Once you have done this, you can add the following line at the beginning of the script which calls holds the datepicker function(s)
$.datepicker.setDefaults( $.datepicker.regional[ "fr" ] );
This will make all datepickers use french language as default.
(The script does pretty much the same thing as in Jason's reply, with a few additional settings)