title: FAL image field in extension flexform
body: <p>Is it possible to create a flexform FAL image field like in the normal tt_content element ?
  I want to implement the functionality displayed in the following screen in an extension flexform field.</p>
  
  <p><img src="https://i.stack.imgur.com/JR8eW.png" alt="enter image description here"></p>
  
  <p>I've created a flexform element, but it has a problem when translating default content element records. When I translate default content element, the images are not copied to translated element.</p>
  
  <p>So I need to implement flexform FAL image field with out bug in translation.</p>