title: Facebook Messenger List Template Update button on click
body: <p>I notice that in FoxNews Facebook Messenger (<a href="https://www.messenger.com/t/FoxNews" rel="nofollow noreferrer">https://www.messenger.com/t/FoxNews</a>), when I click "Add Topic", the button text is changed to "Remove Topic", and vice versa.</p>
  
  <p>Does anyone know how to do that?</p>