Issue #1998992 by damiankloip, andypost: Typo in FieldOverview.php.

core/modules/field_ui/lib/Drupal/field_ui/FieldOverview.php

@@ -132,7 +132,7 @@ public function buildForm(array $form, array &$form_state, $entity_type = NULL,
         ),
         'widget_type' => array(
           '#type' => 'link',
-          '#title' => $widget_configuration ? $widget_types[$widget_configuration['type']]['label'] : $widget_types['hiden']['label'],
+          '#title' => $widget_configuration ? $widget_types[$widget_configuration['type']]['label'] : $widget_types['hidden']['label'],
           '#href' => $admin_field_path . '/widget-type',
           '#options' => array('attributes' => array('title' => t('Change widget type.'))),
         ),

core/modules/field_ui/lib/Drupal/field_ui/Tests/ManageFieldsTest.php

@@ -422,6 +422,15 @@ function testHiddenFields() {
     $bundle_path = 'admin/structure/types/manage/article/fields/';
     $this->drupalGet($bundle_path);
     $this->assertFalse($this->xpath('//select[@id="edit-add-existing-field-field-name"]//option[@value=:field_name]', array(':field_name' => $field_name)), "The 're-use existing field' select respects field types 'no_ui' property.");
+
+    // Remove the form display component to check the fallback label.
+    entity_get_form_display('node', $this->type, 'default')
+      ->removeComponent($field_name)
+      ->save();
+
+    $this->drupalGet('admin/structure/types/manage/' . $this->type . '/fields/');
+    $this->assertLinkByHref(url('admin/structure/types/manage/' . $this->type . '/fields/node.' . $this->type . '.'  . $field_name . '/widget-type'));
+    $this->assertLink('- Hidden -');
   }
 
   /**