new branch patch 179 applied

Closes #2313309

core/lib/Drupal/Core/Cache/Context/AccountAdminLanguageCacheContext.php

+<?php
+
+namespace Drupal\Core\Cache\Context;
+
+use Drupal\Core\Cache\CacheableMetadata;
+use Drupal\Core\Session\AccountProxyInterface;
+
+/**
+ * Defines an AdminLanguageCacheContext service, for "admin language" caching.
+ *
+ * Cache context ID: 'user.admin_language'.
+ */
+class AccountAdminLanguageCacheContext implements CacheContextInterface {
+
+  /**
+   * The current user.
+   *
+   * @var \Drupal\Core\Session\AccountProxyInterface
+   */
+  protected AccountProxyInterface $currentUser;
+
+  /**
+   * Constructs a new AccountAdminLanguageCacheContext service.
+   *
+   * @param \Drupal\Core\Session\AccountProxyInterface $current_user
+   *   The current user.
+   */
+  public function __construct(AccountProxyInterface $current_user) {
+    $this->currentUser = $current_user;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getLabel() {
+    return t("Account's administration language");
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getContext() {
+    return $this->currentUser->getPreferredAdminLangcode();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCacheableMetadata() {
+    return new CacheableMetadata();
+  }
+
+}