title: Jhipster-angular project cannot run at IE11
body: <p>Our project is a generator project based on Jhipster.
  Recently we updated <code>core-js</code> to V3.1.3.
  Except IE11, the project is working fine.
  When we try to visit this project by using IE11 
  It gives us:</p>
  
  <blockquote>
    <p>An error has occurred :-(</p>
    
    <p>Usual error causes<br>
    1.You started the application from an IDE and you didn't run npm start or npm run webpack:build.<br>
    2.You had a network error while running npm install. If you are behind a corporate proxy, it is likely that this error was caused by your
    proxy. Have a look at the JHipster error logs, you will probably have
    the cause of the error.<br>
    3.You installed a Node.js version that doesn't work with JHipster: please use an LTS (long-term support) version, as it's the only
    version we support.</p>
  </blockquote>
  
  <p>Googled some questions about how angular works with IE11.
  We've already added some imports in <code>polyfill.ts</code>.
  Installed <code>classlist.js</code> and <code>web-animation-js</code></p>
  
  <pre><code>import 'classlist.js';
  import 'web-animations-js';
  
  // support for IE 11
  import 'core-js/es/symbol';
  import 'core-js/es/object';
  import 'core-js/es/function';
  import 'core-js/es/parse-int';
  import 'core-js/es/parse-float';
  import 'core-js/es/number';
  import 'core-js/es/math';
  import 'core-js/es/string';
  import 'core-js/es/date';
  import 'core-js/es/array';
  import 'core-js/es/regexp';
  import 'core-js/es/map';
  import 'core-js/es/weak-map';
  import 'core-js/es/set';
  import 'core-js/es/reflect';
  import 'core-js/features/symbol';
  import 'core-js/features/object';
  import 'core-js/features/function';
  import 'core-js/features/parse-int';
  import 'core-js/features/parse-float';
  import 'core-js/features/number';
  import 'core-js/features/math';
  import 'core-js/features/string';
  import 'core-js/features/date';
  import 'core-js/features/array';
  import 'core-js/features/regexp';
  import 'core-js/features/map';
  import 'core-js/features/weak-map';
  import 'core-js/features/set';
  import 'core-js/features/reflect';
  
  
  
  import 'core-js/proposals/reflect-metadata';
  import 'zone.js/dist/zone';
  </code></pre>
  
  <p>In the console there is an error:</p>
  
  <blockquote>
    <p>Google Maps JavaScript API error: RefererNotAllowedMapError
    <a href="https://developers.google.com/maps/documentation/javascript/error-messages#referer-not-allowed-map-error" rel="nofollow noreferrer">https://developers.google.com/maps/documentation/javascript/error-messages#referer-not-allowed-map-error</a>
    Your site URL to be authorized: <a href="http://localhost:9000/" rel="nofollow noreferrer">http://localhost:9000/</a></p>
  </blockquote>
  
  <p>We are not sure if this is related to this issue.</p>
  
  <p>Any help would be appreciated!</p>