reverted:
--- b/core/modules/config_translation/src/Access/ConfigTranslationFormAccess.php
+++ a/core/modules/config_translation/src/Access/ConfigTranslationFormAccess.php
@@ -8,8 +8,8 @@
 namespace Drupal\config_translation\Access;
 
 use Drupal\Core\Access\AccessResult;
-use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\Core\Session\AccountInterface;
+use Symfony\Component\Routing\Route;
 
 /**
  * Checks access for displaying the translation add, edit, and delete forms.
@@ -19,10 +19,10 @@
   /**
    * {@inheritdoc}
    */
+  public function access(Route $route, AccountInterface $account, $langcode = NULL) {
-  public function access(RouteMatchInterface $route_match, AccountInterface $account, $langcode = NULL) {
     // For the translation forms we have a target language, so we need some
     // checks in addition to the checks performed for the translation overview.
+    $base_access = parent::access($route, $account);
-    $base_access = parent::access($route_match, $account);
     if ($base_access->isAllowed()) {
       $target_language = $this->languageManager->getLanguage($langcode);
 
reverted:
--- b/core/modules/config_translation/src/Access/ConfigTranslationOverviewAccess.php
+++ a/core/modules/config_translation/src/Access/ConfigTranslationOverviewAccess.php
@@ -11,8 +11,8 @@
 use Drupal\config_translation\ConfigMapperManagerInterface;
 use Drupal\Core\Access\AccessResult;
 use Drupal\Core\Routing\Access\AccessInterface;
-use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\Core\Session\AccountInterface;
+use Symfony\Component\Routing\Route;
 
 /**
  * Checks access for displaying the configuration translation overview.
@@ -54,20 +54,17 @@
   /**
    * Checks access to the overview based on permissions and translatability.
    *
+   * @param \Symfony\Component\Routing\Route $route
+   *   The route to check against.
-   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
-   *   The route_match to check against.
    * @param \Drupal\Core\Session\AccountInterface $account
    *   The currently logged in account.
    *
    * @return \Drupal\Core\Access\AccessResultInterface
    *   The access result.
    */
+  public function access(Route $route, AccountInterface $account) {
-  public function access(RouteMatchInterface $route_match, AccountInterface $account) {
-    $route = $route_match->getRouteObject();
-
     /** @var \Drupal\config_translation\ConfigMapperInterface $mapper */
     $mapper = $this->configMapperManager->createInstance($route->getDefault('plugin_id'));
-    $mapper->populateFromRouteMatch($route_match);
     $this->sourceLanguage = $this->languageManager->getLanguage($mapper->getLangcode());
 
     // Allow access to the translation overview if the proper permission is
reverted:
--- b/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
+++ a/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
@@ -660,7 +660,7 @@
       $config->save();
 
       // Go to the translation page of the 'files' view.
+      $translation_url = 'admin/structure/views/view/files/translate/' . $langcode . '/add';
-      $translation_url = 'admin/structure/views/view/files/translate/en/add';
       $this->drupalGet($translation_url);
 
       // Check if the expected number of source elements are present.