[MD settings] adding load time data behavior for i18n strings

chrome/browser/resources/settings/i18n_behavior/i18n_behavior.js

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview
+ * 'I18nBehavior' is a behavior to mix in loading of
+ * internationalization strings.
+ *
+ * Example:
+ *   behaviors: [
+ *     I18nBehavior,
+ *   ],
+ *
+ * @group Chrome Settings Elements
+ */
+
+var I18nBehavior = {
+  /**
+   * @param {string} id The ID of the string to translate.
+   * @param {...var_args} Placeholders required by the string ($1-9).
+   * @return {string} A translated, substituted string.
+   */
+  i18n: function(id, var_args) {
+    return loadTimeData.getStringF.apply(loadTimeData, arguments);
+  },
+};