Content language settings form

work.patch

diff --git a/core/modules/content_translation/content_translation.admin.inc b/core/modules/content_translation/content_translation.admin.inc
index 231dbc6..5832aed 100644
--- a/core/modules/content_translation/content_translation.admin.inc
+++ b/core/modules/content_translation/content_translation.admin.inc
@@ -86,12 +86,17 @@ function _content_translation_form_language_content_settings_form_alter(array &$
   foreach ($form['#labels'] as $entity_type_id => $label) {
     $entity_type = $entity_manager->getDefinition($entity_type_id);
     $storage_definitions = $entity_type instanceof ContentEntityTypeInterface ? $entity_manager->getFieldStorageDefinitions($entity_type_id) : array();
+    $entity_type_translatable = $entity_type->isTranslatable();
+    $form['settings'][$entity_type_id]['#translatable'] = $entity_type_translatable;
 
     foreach (entity_get_bundles($entity_type_id) as $bundle => $bundle_info) {
       // Here we do not want the widget to be altered and hold also the "Enable
       // translation" checkbox, which would be redundant. Hence we add this key
       // to be able to skip alterations.
       $form['settings'][$entity_type_id][$bundle]['settings']['language']['#content_translation_skip_alter'] = TRUE;
+      if (!$entity_type_translatable) {
+        continue;
+      }
 
       $fields = $entity_manager->getFieldDefinitions($entity_type_id, $bundle);
       if ($fields) {
@@ -138,13 +143,12 @@ function _content_translation_form_language_content_settings_form_alter(array &$
 function _content_translation_preprocess_language_content_settings_table(&$variables) {
   // Alter the 'build' variable injecting the translation settings if the user
   // has the required permission.
-  if (!\Drupal::currentUser()->hasPermission('administer content translation')) {
+  $element = $variables['element'];
+  if (empty($element['#translatable']) || !\Drupal::currentUser()->hasPermission('administer content translation')) {
     return;
   }
 
-  $element = $variables['element'];
   $build = &$variables['build'];
-
   array_unshift($build['#header'], array('data' => t('Translatable'), 'class' => array('translatable')));
   $rows = array();
 
diff --git a/core/modules/language/language.module b/core/modules/language/language.module
index 01113ca..565e008 100644
--- a/core/modules/language/language.module
+++ b/core/modules/language/language.module
@@ -547,6 +547,8 @@ function language_field_info_alter(&$info) {
  * Implements hook_entity_field_access()
  */
 function language_entity_field_access($operation, FieldDefinitionInterface $field_definition, AccountInterface $account, FieldItemListInterface $items = NULL) {
+  // @todo Use the language entity key here.
+  //   See https://www.drupal.org/node/2143729.
   if ($field_definition->getName() == 'langcode') {
     $language_configuration = language_get_default_configuration($field_definition->getTargetEntityTypeId(), $items->getEntity()->bundle());
     return AccessResult::forbiddenIf(!$language_configuration['language_show']);
diff --git a/core/modules/language/src/Form/ContentLanguageSettingsForm.php b/core/modules/language/src/Form/ContentLanguageSettingsForm.php
index a415379..b48517f 100644
--- a/core/modules/language/src/Form/ContentLanguageSettingsForm.php
+++ b/core/modules/language/src/Form/ContentLanguageSettingsForm.php
@@ -8,6 +8,7 @@
 namespace Drupal\language\Form;
 
 use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Entity\ContentEntityTypeInterface;
 use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\Form\ConfigFormBase;
 use Drupal\Core\Form\FormStateInterface;
@@ -68,7 +69,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
     $bundles = $this->entityManager->getAllBundleInfo();
     $language_configuration = array();
     foreach ($entity_types as $entity_type_id => $entity_type) {
-      if (!$entity_type->isTranslatable()) {
+      if (!$entity_type instanceof ContentEntityTypeInterface || !isset($this->entityManager->getBaseFieldDefinitions($entity_type_id)['langcode'])) {
         continue;
       }
       $labels[$entity_type_id] = $entity_type->getLabel() ?: $entity_type_id;

Line #69 does not work well as all (core) content entity types have a language field.