title: Angular CLI 6: Unknown option: '--locale'
body: <p>Running <code>ng serve</code> with a custom locale data as the docs explain (<a href="https://next.angular.io/guide/i18n" rel="noreferrer">https://next.angular.io/guide/i18n</a>)  in the new Angular 6, I'm getting this error:</p>
  
  <pre><code>Unknown option: '--locale'
  </code></pre>
  
  <p>The same is happening with <code>delete-output-path</code> and <code>named-chunks</code>. How can we set this flags now?</p>