app.component.html

<div id="top-container">
  <div id="left-menu">
    <router-outlet name="left-menu"></router-outlet>
  </div>

  <div id="contentarea">
    <div id="topbar">
      <top-menu></top-menu>
      <h1>{{"Testing"|i18n}}</h1>
    </div>
    <div id="content">
      <router-outlet></router-outlet>
    </div>
  </div>
</div>