Update to Drupal 8.1.8. For more information, see https://www.drupal.org/project/drupal/releases/8.1.8

core/modules/language/migration_templates/d6_language_content_settings.yml

@@ -1,5 +1,6 @@
 id: d6_language_content_settings
 label: Drupal 6 language content settings
+
 migration_tags:
   - Drupal 6
 source:
@@ -39,6 +40,8 @@ process:
       2: true
 destination:
   plugin: entity:language_content_settings
+  content_translation_update_definitions:
+    - node
 migration_dependencies:
   required:
     - d6_node_type

core/modules/language/migration_templates/d7_language_content_settings.yml

@@ -39,6 +39,8 @@ process:
       2: true
 destination:
   plugin: entity:language_content_settings
+  content_translation_update_definitions:
+    - node
 migration_dependencies:
   required:
     - d7_node_type

core/modules/language/src/LanguageNegotiator.php

@@ -276,8 +276,8 @@ class LanguageNegotiator implements LanguageNegotiatorInterface {
    */
   function purgeConfiguration() {
     // Ensure that we are getting the defined language negotiation information.
-    // An invocation of \Drupal\Core\Extension\ModuleHandler::install() or
-    // \Drupal\Core\Extension\ModuleHandler::uninstall() could invalidate the
+    // An invocation of \Drupal\Core\Extension\ModuleInstaller::install() or
+    // \Drupal\Core\Extension\ModuleInstaller::uninstall() could invalidate the
     // cached information.
     $this->negotiatorManager->clearCachedDefinitions();
     $this->languageManager->reset();
@@ -291,8 +291,8 @@ class LanguageNegotiator implements LanguageNegotiatorInterface {
    */
   function updateConfiguration(array $types) {
     // Ensure that we are getting the defined language negotiation information.
-    // An invocation of \Drupal\Core\Extension\ModuleHandler::install() or
-    // \Drupal\Core\Extension\ModuleHandler::uninstall() could invalidate the
+    // An invocation of \Drupal\Core\Extension\ModuleInstaller::install() or
+    // \Drupal\Core\Extension\ModuleInstaller::uninstall() could invalidate the
     // cached information.
     $this->negotiatorManager->clearCachedDefinitions();
     $this->languageManager->reset();