title: Angular TranslateService translate <title> tag
body: <p>Using the <code>TranslateService</code> in Angular I want the <code>&lt;title&gt;</code> tag which sits in the <code>index.html</code>  to be in different languages. </p>
  
  <pre><code>&lt;title translate&gt;application.title&lt;/title&gt;
  </code></pre>
  
  <p>I translate all other html tags like that unless they are custom html tags then it's like this:</p>
  
  <pre><code>{{"document.name"|translate}}
  </code></pre>
  
  <p>The problem might be that index.html is in a different level in the folders</p>
  
  <p>src<br>
  |-app<br>
  ....  |-translation<br>
  |-index.html</p>