Issue #2994000 by Lendude, Pasqualle, quietone, pameeela: Notice in logs when...

Issue #2994000 by Lendude, Pasqualle, quietone, pameeela: Notice in logs when setting invalid translation config for a content type

(cherry picked from commit da9a2b40)

core/modules/content_translation/content_translation.module

@@ -619,7 +619,7 @@ function content_translation_language_configuration_element_validate($element, F
   $values = $form_state->getValue($key);
   if (!$values['language_alterable'] && $values['content_translation'] && \Drupal::languageManager()->isLanguageLocked($values['langcode'])) {
     foreach (\Drupal::languageManager()->getLanguages(LanguageInterface::STATE_LOCKED) as $language) {
-      $locked_languages[] = $language->getName();
+      $locked_languages[$language->getId()] = $language->getName();
     }
     // @todo Set the correct form element name as soon as the element parents
     //   are correctly set. We should be using NestedArray::getValue() but for

core/modules/content_translation/tests/src/Functional/ContentTranslationSettingsTest.php

@@ -204,6 +204,17 @@ public function testSettingsUI() {
       $this->assertEquals($definitions['body']->isTranslatable(), $field->isTranslatable(), 'Configurable field translatability correctly switched.');
     }
 
+    // Test that we can't use the 'Not specified' default language when it is
+    // not showing in the language selector.
+    $edit = [
+      'language_configuration[langcode]' => 'und',
+      'language_configuration[language_alterable]' => FALSE,
+      'language_configuration[content_translation]' => TRUE,
+    ];
+    $this->drupalGet('admin/structure/types/manage/article');
+    $this->submitForm($edit, 'Save content type');
+    $this->getSession()->getPage()->hasContent('"Show language selector" is not compatible with translating content that has default language: und. Either do not hide the language selector or pick a specific language.');
+
     // Test that the order of the language list is similar to other language
     // lists, such as in Views UI.
     $this->drupalGet('admin/config/regional/content-language');