fix(demo): add Intl polyfill [fixes #2215] (#2238)

Author: IlyaSurmay

demo/src/polyfills.ts

@@ -19,3 +19,6 @@ import 'core-js/es6/reflect';
 import 'core-js/es7/reflect';
 import 'zone.js/dist/zone';
 import 'classlist-polyfill';
+
+import 'intl';
+import 'intl/locale-data/jsonp/en';

package.json

@@ -95,6 +95,7 @@
     "gitignore-to-glob": "0.3.0",
     "google-code-prettify": "1.0.5",
     "html-loader": "0.4.5",
+    "intl": "^1.2.5",
     "jasmine": "2.6.0",
     "jasmine-core": "2.6.1",
     "jasmine-data-provider": "2.2.0",