Issue #2493557 by pfrenssen: Fatal error when creating a translatable vocabulary type

core/modules/taxonomy/src/Tests/VocabularyTranslationTest.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\taxonomy\Tests\VocabularyTranslationTest.
+ */
+namespace Drupal\taxonomy\Tests;
+
+use Drupal\Component\Utility\Unicode;
+
+/**
+ * Tests content translation for vocabularies.
+ *
+ * @group taxonomy
+ */
+class VocabularyTranslationTest extends TaxonomyTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = array('content_translation', 'language');
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Create an administrative user.
+    $this->drupalLogin($this->drupalCreateUser([
+      'administer taxonomy',
+      'administer content translation',
+    ]));
+  }
+
+  /**
+   * Tests language settings for vocabularies.
+   */
+  function testVocabularyLanguage() {
+    $this->drupalGet('admin/structure/taxonomy/add');
+
+    // Check that the field to enable content translation is available.
+    $this->assertField('edit-default-language-content-translation', 'The content translation checkbox is present on the page.');
+
+    // Create the vocabulary.
+    $vid = Unicode::strtolower($this->randomMachineName());
+    $edit['name'] = $this->randomMachineName();
+    $edit['description'] = $this->randomMachineName();
+    $edit['langcode'] = 'en';
+    $edit['vid'] = $vid;
+    $edit['default_language[content_translation]'] = TRUE;
+    $this->drupalPostForm(NULL, $edit, t('Save'));
+
+    // Check if content translation is enabled on the edit page.
+    $this->drupalGet('admin/structure/taxonomy/manage/' . $vid);
+    $this->assertFieldChecked('edit-default-language-content-translation', 'The content translation was correctly selected.');
+  }
+
+}

core/modules/taxonomy/src/VocabularyForm.php

@@ -115,26 +115,6 @@ public function form(array $form, FormStateInterface $form_state) {
     return parent::form($form, $form_state, $vocabulary);
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  protected function actions(array $form, FormStateInterface $form_state) {
-    // If we are displaying the delete confirmation skip the regular actions.
-    if (!$form_state->get('confirm_delete')) {
-      $actions = parent::actions($form, $form_state);
-      // We cannot leverage the regular submit handler definition because we
-      // have button-specific ones here. Hence we need to explicitly set it for
-      // the submit action, otherwise it would be ignored.
-      if ($this->moduleHandler->moduleExists('content_translation')) {
-        array_unshift($actions['submit']['#submit'], 'content_translation_language_configuration_element_submit');
-      }
-      return $actions;
-    }
-    else {
-      return array();
-    }
-  }
-
   /**
    * {@inheritdoc}
    */