title: TYPO3 selectMultipleSideBySide translate "Available Items" per record type
body: <p>I want to override the label strings "Available Items" and "Selected Items" in a selectMultipleSideBySide form because it is too generic. I have multiple record types using this form template so I cannot change the strings globally.</p>
  
  <p>I tried to change it in the TCA of my custom record type without success. I only see the label for the entire relation.</p>
  
  <p>I am using TYPO3 8.7</p>
  
  <p>Does anyone know an extension which accomplished this or does anyone know the config path to there?</p>
  
  <p>Thanks!</p>
  
  <p><strong>Edit:</strong>
  In the class typo3/sysext/backend/Classes/Form/Element/SelectMultipleSideBySideElement.php at line 393 I found the translation path hard-coded. So I need to inherit from this class and register it as my new selectMultipleSideBySide in the TCA.</p>