Update SonataAdminBundle.en.xliff

It was missing the variable %object% in message_delete_confirmation translation from SonataAdminBundle:CRUD:delete.html.twig

Resources/translations/SonataAdminBundle.en.xliff

@@ -184,7 +184,7 @@
             </trans-unit>
             <trans-unit id="message_delete_confirmation">
                 <source>message_delete_confirmation</source>
-                <target>Are you sure you want to delete the selected element?</target>
+                <target>Are you sure you want to delete the selected "%object%" element?</target>
             </trans-unit>
             <trans-unit id="btn_delete">
                 <source>btn_delete</source>