Issue #3424008: Translations handling for 2.x version

Closes #3424008

js/locale.js

+(function ($, Drupal, drupalSettings) {
+  Drupal.behaviors.jqueryUiDatepickerLocale = {
+    attach: function attach(context, settings) {
+      $.datepicker.regional['drupal-locale'] = $.extend({
+        closeText: Drupal.t('Done'),
+        prevText: Drupal.t('Prev'),
+        nextText: Drupal.t('Next'),
+        currentText: Drupal.t('Today'),
+        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' })
+        ],
+        monthNamesShort: [
+          Drupal.t('Jan', {}, { context: 'Abbreviated month name' }),
+          Drupal.t('Feb', {}, { context: 'Abbreviated month name' }),
+          Drupal.t('Mar', {}, { context: 'Abbreviated month name' }),
+          Drupal.t('Apr', {}, { context: 'Abbreviated month name' }),
+          Drupal.t('May', {}, { context: 'Abbreviated month name' }),
+          Drupal.t('Jun', {}, { context: 'Abbreviated month name' }),
+          Drupal.t('Jul', {}, { context: 'Abbreviated month name' }),
+          Drupal.t('Aug', {}, { context: 'Abbreviated month name' }),
+          Drupal.t('Sep', {}, { context: 'Abbreviated month name' }),
+          Drupal.t('Oct', {}, { context: 'Abbreviated month name' }),
+          Drupal.t('Nov', {}, { context: 'Abbreviated month name' }),
+          Drupal.t('Dec', {}, { context: 'Abbreviated month name' })
+        ],
+        dayNames: [
+          Drupal.t('Sunday'),
+          Drupal.t('Monday'),
+          Drupal.t('Tuesday'),
+          Drupal.t('Wednesday'),
+          Drupal.t('Thursday'),
+          Drupal.t('Friday'),
+          Drupal.t('Saturday')
+        ],
+        dayNamesShort: [
+          Drupal.t('Sun', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('Mon', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('Tue', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('Wed', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('Thu', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('Fri', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('Sat', {}, { context: 'Abbreviated weekday' })
+        ],
+        dayNamesMin: [
+          Drupal.t('Su', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('Mo', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('Tu', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('We', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('Th', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('Fr', {}, { context: 'Abbreviated weekday' }),
+          Drupal.t('Sa', {}, { context: 'Abbreviated weekday' })
+        ],
+        dateFormat: Drupal.t('mm/dd/yy'),
+        firstDay: 0,
+        isRTL: 0
+      }, drupalSettings.jquery.ui.datepicker);
+      $.datepicker.setDefaults($.datepicker.regional['drupal-locale']);
+    }
+  };
+})(jQuery, Drupal, drupalSettings);