title: put new line in string to translate
body: <p>I'm using ngx-translate.</p>
  
  <p>How can I put a line break in a string to translate ?</p>
  
  <p>In my template I have : </p>
  
  <pre><code>{{'STRING_TO_TRANSLATE' | translate}}
  </code></pre>
  
  <p>In my en.json:</p>
  
  <pre><code>{
  "STRING_TO_TRANSLATE": "text on first line. &lt;br&gt; or \n don't work. Text on second line"
  }
  </code></pre>