feat(i18n): provide LOCALE_ID and NgLocalization

modules/@angular/core/test/application_module_spec.ts

@@ -0,0 +1,17 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {LOCALE_ID} from '@angular/core';
+import {beforeEach, beforeEachProviders, ddescribe, describe, expect, iit, inject, it, xdescribe, xit} from '../testing/testing_internal';
+
+export function main() {
+  describe('Application module', () => {
+    it('should set the default locale to "en_US"',
+       inject([LOCALE_ID], (defaultLocale: string) => { expect(defaultLocale).toEqual('en_US'); }));
+  });
+}