diff --git a/core/modules/language/config/schema/language.schema.yml b/core/modules/language/config/schema/language.schema.yml
index 9a13f38..204b9b0 100644
--- a/core/modules/language/config/schema/language.schema.yml
+++ b/core/modules/language/config/schema/language.schema.yml
@@ -120,6 +120,11 @@ language.content_settings.*.*:
     language_exposed:
       type: boolean
       label: 'Show language selector on create and edit pages'
+    third_party_settings:
+      type: sequence
+      label: 'Third party settings'
+      sequence:
+        - type: content_settings.third_party.[%key]
 
 condition.plugin.language:
   type: condition.plugin
diff --git a/core/modules/language/src/Entity/ContentLanguageSettings.php b/core/modules/language/src/Entity/ContentLanguageSettings.php
index 8032432..d4a90d6 100644
--- a/core/modules/language/src/Entity/ContentLanguageSettings.php
+++ b/core/modules/language/src/Entity/ContentLanguageSettings.php
@@ -8,6 +8,7 @@
 namespace Drupal\language\Entity;
 
 use Drupal\Core\Config\Entity\ConfigEntityBase;
+use Drupal\Core\Config\Entity\ThirdPartySettingsTrait;
 use Drupal\Core\Entity\EntityStorageInterface;
 use Drupal\Core\Language\LanguageInterface;
 
@@ -27,6 +28,8 @@
  */
 class ContentLanguageSettings extends ConfigEntityBase {
 
+  use ThirdPartySettingsTrait;
+
   /**
    * The id. Combination of $entity_type.$bundle.
    *