Angular 5 Breaking change - manually import locale : <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>
