Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/language/src/LanguageAccessControlHandler.php

@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\language\LanguageAccessControlHandler.
+ */
+
+namespace Drupal\language;
+
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Entity\EntityAccessControlHandler;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Session\AccountInterface;
+
+/**
+ * Defines the access control handler for the language entity type.
+ *
+ * @see \Drupal\language\Entity\Language
+ */
+class LanguageAccessControlHandler extends EntityAccessControlHandler {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function checkAccess(EntityInterface $entity, $operation, $langcode, AccountInterface $account) {
+    switch ($operation) {
+      case 'update':
+        /* @var \Drupal\Core\Language\LanguageInterface $entity */
+        return AccessResult::allowedIf(!$entity->isLocked())->cacheUntilEntityChanges($entity)
+          ->andIf(parent::checkAccess($entity, $operation, $langcode, $account));
+
+      case 'delete':
+        /* @var \Drupal\Core\Language\LanguageInterface $entity */
+        return AccessResult::allowedIf(!$entity->isLocked())->cacheUntilEntityChanges($entity)
+          ->andIf(AccessResult::allowedIf(!$entity->isDefault())->cacheUntilEntityChanges($entity))
+          ->andIf(parent::checkAccess($entity, $operation, $langcode, $account));
+
+      default:
+        // No opinion.
+        return AccessResult::neutral();
+    }
+  }
+
+}