Put each entity type table into a details element on admin/config/regional/content-language

Closes #3210684

core/modules/migrate_drupal/src/Plugin/migrate/source/ContentEntity.php

@@ -231,6 +231,10 @@ public function query() {
     if (!empty($this->configuration['bundle'])) {
       $query->condition($this->entityType->getKey('bundle'), $this->configuration['bundle']);
     }
+    // Exclude anonymous user account.
+    if ($this->entityType->id() === 'user' && !empty($this->entityType->getKey('id'))) {
+      $query->condition($this->entityType->getKey('id'), 0, '>');
+    }
     return $query;
   }