https://villailpoggiale.it/modules/contrib/jquery_ui_datepicker/js/locale.js?t2424r

1(function ($, Drupal, drupalSettings) {
2  Drupal.behaviors.jqueryUiDatepickerLocale = {
3    attach: function attach(context, settings) {
4      $.datepicker.regional['drupal-locale'] = $.extend({
5        closeText: Drupal.t('Done'),
6        prevText: Drupal.t('Prev'),
7        nextText: Drupal.t('Next'),
8        currentText: Drupal.t('Today'),
9        monthNames: [Drupal.t('January', {}, { context: 'Long month name' }), Drupal.t('February', {}, { context: 'Long month name' }), Drupal.t('March', {}, { context: 'Long month name' }), Drupal.t('April', {}, { context: 'Long month name' }), Drupal.t('May', {}, { context: 'Long month name' }), Drupal.t('June', {}, { context: 'Long month name' }), Drupal.t('July', {}, { context: 'Long month name' }), Drupal.t('August', {}, { context: 'Long month name' }), Drupal.t('September', {}, { context: 'Long month name' }), Drupal.t('October', {}, { context: 'Long month name' }), Drupal.t('November', {}, { context: 'Long month name' }), Drupal.t('December', {}, { context: 'Long month name' })],
10        monthNamesShort: [Drupal.t('Jan'), Drupal.t('Feb'), Drupal.t('Mar'), Drupal.t('Apr'), Drupal.t('May'), Drupal.t('Jun'), Drupal.t('Jul'), Drupal.t('Aug'), Drupal.t('Sep'), Drupal.t('Oct'), Drupal.t('Nov'), Drupal.t('Dec')],
11        dayNames: [Drupal.t('Sunday'), Drupal.t('Monday'), Drupal.t('Tuesday'), Drupal.t('Wednesday'), Drupal.t('Thursday'), Drupal.t('Friday'), Drupal.t('Saturday')],
12        dayNamesShort: [Drupal.t('Sun'), Drupal.t('Mon'), Drupal.t('Tue'), Drupal.t('Wed'), Drupal.t('Thu'), Drupal.t('Fri'), Drupal.t('Sat')],
13        dayNamesMin: [Drupal.t('Su'), Drupal.t('Mo'), Drupal.t('Tu'), Drupal.t('We'), Drupal.t('Th'), Drupal.t('Fr'), Drupal.t('Sa')],
14        dateFormat: Drupal.t('mm/dd/yy'),
15        firstDay: 0,
16        isRTL: 0
17      }, drupalSettings.jquery.ui.datepicker);
18      $.datepicker.setDefaults($.datepicker.regional['drupal-locale']);
19    }
20  };
21})(jQuery, Drupal, drupalSettings);