title: Insert an icon into a link with HTMLhelper in CakePHP 3
body: <p>I want to replace text with a fontawesome icon in a link being created with CakePHP's HTMLhelper. </p>
  
  <p>Here is the text version that works just fine:</p>
  
  <pre>
  Html->link('View', ['action' => 'view', $menuitem->id], ['title' => __('View'),'class' => 'btn btn-info btn-xs']) ?>
  </pre>
  
  <p>And here is an example of what I want to accomplish:</p>
  
  <pre>
  Html->link('span with icon goes here', ['action' => 'view', $menuitem->id], ['title' => __('View'),'class' => 'btn btn-info btn-xs']) ?>
  </pre>
  
  <p>Any ideas would be helpful. Thx!</p>