title: Which extension contains the class ModelSavingExceptionTranslationHandler?
body: <p>I need to create a new class which extends ModelSavingExceptionTranslationHandler.</p>
  <p>When I try to write it as:</p>
  <pre><code>import 
   de.hybris.platform.platformbackoffice.services.handlers.ModelSavingExceptionTranslationHandler;
  </code></pre>
  <p>I want to know which extension does it belong to so that I configure this in extensioninfo.xml.When I configure platformbackoffice, this is still not resolved.</p>