diff --git a/core/modules/edit/lib/Drupal/edit/Tests/EditLoadingTest.php b/core/modules/edit/lib/Drupal/edit/Tests/EditLoadingTest.php
index 914c0e4..c76ed89 100644
--- a/core/modules/edit/lib/Drupal/edit/Tests/EditLoadingTest.php
+++ b/core/modules/edit/lib/Drupal/edit/Tests/EditLoadingTest.php
@@ -290,6 +290,88 @@ public function testUserWithPermission() {
   }
 
   /**
+   * Tests the loading of Edit for the title base field.
+   */
+  public function testTitleBaseField() {
+    $this->drupalLogin($this->editor_user);
+    $this->drupalGet('node/1');
+
+    // Retrieving the metadata should result in a 200 JSON response.
+    $htmlPageDrupalSettings = $this->drupalSettings;
+    $post = array('fields[0]' => 'node/1/title/und/full');
+    $response = $this->drupalPost('edit/metadata', 'application/json', $post);
+    $this->assertResponse(200);
+    $expected = array(
+      'node/1/title/und/full' => array(
+        'label' => 'Title',
+        'access' => TRUE,
+        'editor' => 'plain_text',
+        'aria' => 'Entity node 1, field Title',
+      )
+    );
+    $this->assertIdentical(drupal_json_decode($response), $expected, 'The metadata HTTP request answers with the correct JSON response.');
+    // Restore drupalSettings to build the next requests; simpletest wipes them
+    // after a JSON response.
+    $this->drupalSettings = $htmlPageDrupalSettings;
+
+    // Retrieving the form for this field should result in a 200 response,
+    // containing only an editFieldForm command.
+    $post = array('nocssjs' => 'true', 'reset' => 'true') + $this->getAjaxPageStatePostData();
+    $response = $this->drupalPost('edit/form/' . 'node/1/title/und/full', 'application/vnd.drupal-ajax', $post);
+    $this->assertResponse(200);
+    $ajax_commands = drupal_json_decode($response);
+    $this->assertIdentical(1, count($ajax_commands), 'The field form HTTP request results in one AJAX command.');
+    $this->assertIdentical('editFieldForm', $ajax_commands[0]['command'], 'The first AJAX command is an editFieldForm command.');
+    $this->assertIdentical('<form ', Unicode::substr($ajax_commands[0]['data'], 0, 6), 'The editFieldForm command contains a form.');
+
+    // Prepare form values for submission. drupalPostAjaxForm() is not suitable
+    // for handling pages with JSON responses, so we need our own solution
+    // here.
+    $form_tokens_found = preg_match('/\sname="form_token" value="([^"]+)"/', $ajax_commands[0]['data'], $token_match) && preg_match('/\sname="form_build_id" value="([^"]+)"/', $ajax_commands[0]['data'], $build_id_match);
+    $this->assertTrue($form_tokens_found, 'Form tokens found in output.');
+
+    if ($form_tokens_found) {
+      $edit = array(
+        'title[0][value]' => 'Obligatory question',
+        'op' => t('Save'),
+      );
+      $post = array(
+        'form_id' => 'edit_field_form',
+        'form_token' => $token_match[1],
+        'form_build_id' => $build_id_match[1],
+      );
+      $post += $edit + $this->getAjaxPageStatePostData();
+
+      // Submit field form and check response. This should store the
+      // updated entity in TempStore on the server.
+      $response = $this->drupalPost('edit/form/' . 'node/1/title/und/full', 'application/vnd.drupal-ajax', $post);
+      $this->assertResponse(200);
+      $ajax_commands = drupal_json_decode($response);
+      $this->assertIdentical(1, count($ajax_commands), 'The field form HTTP request results in one AJAX command.');
+      $this->assertIdentical('editFieldFormSaved', $ajax_commands[0]['command'], 'The first AJAX command is an editFieldFormSaved command.');
+      $this->assertTrue(strpos($ajax_commands[0]['data'], 'Obligatory question'), 'Form value saved and printed back.');
+
+      // Ensure the text on the original node did not change yet.
+      $this->drupalGet('node/1');
+      $this->assertNoText('Obligatory question');
+
+      // Save the entity by moving the TempStore values to entity storage.
+      $post = array('nocssjs' => 'true');
+      $response = $this->drupalPost('edit/entity/' . 'node/1', 'application/json', $post);
+      $this->assertResponse(200);
+      $ajax_commands = drupal_json_decode($response);
+      $this->assertIdentical(1, count($ajax_commands), 'The entity submission HTTP request results in one AJAX command.');
+      $this->assertIdentical('editEntitySaved', $ajax_commands[0]['command'], 'The first AJAX command is an editEntitySaved command.');
+      $this->assertIdentical($ajax_commands[0]['data']['entity_type'], 'node', 'Saved entity is of type node.');
+      $this->assertIdentical($ajax_commands[0]['data']['entity_id'], '1', 'Entity id is 1.');
+
+      // Ensure the text on the original node did change.
+      $this->drupalGet('node/1');
+      $this->assertText('Obligatory question');
+    }
+  }
+
+  /**
    * Tests that Edit doesn't make pseudo fields or computed fields editable.
    */
   public function testPseudoFields() {
diff --git a/core/modules/field/field.deprecated.inc b/core/modules/field/field.deprecated.inc
index 9578f3d..abe5a37 100644
--- a/core/modules/field/field.deprecated.inc
+++ b/core/modules/field/field.deprecated.inc
@@ -895,18 +895,15 @@ function field_valid_language($langcode, $default = TRUE) {
  */
 function field_language(EntityInterface $entity, $field_name = NULL, $langcode = NULL) {
   $langcode = \Drupal::entityManager()->getTranslationFromContext($entity, $langcode)->language()->id;
-  $definitions = $entity->getPropertyDefinitions();
   $translatable = field_has_translation_handler($entity->entityType());
   if (!isset($field_name)) {
     $display_langcodes = array();
-    foreach ($definitions as $name => $definition) {
-      if ($definition->isConfigurable()) {
-        $display_langcodes[$name] = $translatable ? $langcode : Language::LANGCODE_NOT_SPECIFIED;
-      }
+    foreach ($entity->getPropertyDefinitions() as $name => $definition) {
+      $display_langcodes[$name] = $translatable ? $langcode : Language::LANGCODE_NOT_SPECIFIED;
     }
     return $display_langcodes;
   }
-  elseif ($definitions[$field_name]->isConfigurable()) {
+  else {
     return $translatable ? $langcode : Language::LANGCODE_NOT_SPECIFIED;
   }
 }