Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/locale/locale.admin.js

@@ -0,0 +1,104 @@
+/**
+ * @file
+ * Locale admin behavior.
+ */
+
+(function ($, Drupal) {
+
+  "use strict";
+
+  /**
+   * Marks changes of translations.
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.localeTranslateDirty = {
+    attach: function () {
+      var $form = $("#locale-translate-edit-form").once('localetranslatedirty');
+      if ($form.length) {
+        // Display a notice if any row changed.
+        $form.one('formUpdated.localeTranslateDirty', 'table', function () {
+          var $marker = $(Drupal.theme('localeTranslateChangedWarning')).hide();
+          $(this).addClass('changed').before($marker);
+          $marker.fadeIn('slow');
+        });
+        // Highlight changed row.
+        $form.on('formUpdated.localeTranslateDirty', 'tr', function () {
+          var $row = $(this);
+          var $rowToMark = $row.once('localemark');
+          var marker = Drupal.theme('localeTranslateChangedMarker');
+
+          $row.addClass('changed');
+          // Add an asterisk only once if row changed.
+          if ($rowToMark.length) {
+            $rowToMark.find('td:first-child .form-item').append(marker);
+          }
+        });
+      }
+    },
+    detach: function (context, settings, trigger) {
+      if (trigger === 'unload') {
+        var $form = $("#locale-translate-edit-form").removeOnce('localetranslatedirty');
+        if ($form.length) {
+          $form.off('formUpdated.localeTranslateDirty');
+        }
+      }
+    }
+  };
+
+  /**
+   * Show/hide the description details on Available translation updates page.
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.hideUpdateInformation = {
+    attach: function (context, settings) {
+      var $table = $('#locale-translation-status-form').once('expand-updates');
+      if ($table.length) {
+        var $tbodies = $table.find('tbody');
+
+        // Open/close the description details by toggling a tr class.
+        $tbodies.on('click keydown', '.description', function (e) {
+          if (e.keyCode && (e.keyCode !== 13 && e.keyCode !== 32)) {
+            return;
+          }
+          e.preventDefault();
+          var $tr = $(this).closest('tr');
+
+          $tr.toggleClass('expanded');
+
+          // Change screen reader text.
+          $tr.find('.locale-translation-update__prefix').text(function () {
+            if ($tr.hasClass('expanded')) {
+              return Drupal.t('Hide description');
+            }
+            else {
+              return Drupal.t('Show description');
+            }
+          });
+        });
+        $table.find('.requirements, .links').hide();
+      }
+    }
+  };
+
+  $.extend(Drupal.theme, /** @lends Drupal.theme */{
+
+    /**
+     *
+     * @return {string}
+     */
+    localeTranslateChangedMarker: function () {
+      return '<abbr class="warning ajax-changed" title="' + Drupal.t('Changed') + '">*</abbr>';
+    },
+
+    /**
+     *
+     * @return {string}
+     */
+    localeTranslateChangedWarning: function () {
+      return '<div class="clearfix messages messages--warning">' + Drupal.theme('localeTranslateChangedMarker') + ' ' + Drupal.t('Changes made in this table will not be saved until the form is submitted.') + '</div>';
+    }
+  });
+
+})(jQuery, Drupal);