title: Angular 5 Breaking change - manually import locale
body: <p>Changelog says:</p>
  
  <blockquote>
    <p>By default Angular now only contains locale data for the language
    en-US, if you set the value of LOCALE_ID to another locale, you will
    have to import new locale data for this language because we don’t use
    the intl API anymore.</p>
  </blockquote>
  
  <p>But I can not find any reference what "importing" means, how to do it and I get</p>
  
  <blockquote>
    <p>xxx.html:30 ERROR Error: Missing locale data for the
    locale "de-CH"</p>
  </blockquote>
  
  <p>I configure locale with :</p>
  
  <pre><code>import { LOCALE_ID } from '@angular/core';
  </code></pre>
  
  <p>and</p>
  
  <pre><code>  providers: [
      { provide: LOCALE_ID, useValue: 'de-CH' }
    ],
  </code></pre>