Resolve #3413716 "Add revision log"

Closes #3413716

core/lib/Drupal/Core/Entity/ContentEntityDeleteForm.php

@@ -64,6 +64,10 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
     if (!$entity->isDefaultTranslation()) {
       $untranslated_entity = $entity->getUntranslated();
       $untranslated_entity->removeTranslation($entity->language()->getId());
+      if ($untranslated_entity instanceof RevisionLogInterface) {
+        $message = t('Deleted translation in %language', ['%language' => $entity->language()->getName()]);
+        $untranslated_entity->setRevisionLogMessage($message);
+      }
       $untranslated_entity->save();
       $form_state->setRedirectUrl($untranslated_entity->toUrl('canonical'));
     }

[Taras Korpach]

$message provides the following message: 'The @entity-type %label @language translation has been deleted.'. Is there anything wrong with this?