diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/BooleanFormatter.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/BooleanFormatter.php
index b1d2d8b..72654f5 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/BooleanFormatter.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/BooleanFormatter.php
@@ -10,6 +10,7 @@
 use Drupal\Core\Field\FormatterBase;
 use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\Component\Utility\SafeMarkup;
 
 /**
  * Plugin implementation of the 'boolean' formatter.
@@ -56,6 +57,7 @@ protected function getOutputFormats() {
       'enabled-disabled' => [$this->t('Enabled'), $this->t('Disabled')],
       'boolean' => [1, 0],
       'unicode-yes-no' => ['✔', '✖'],
+      'label' => $this->fieldDefinition->getLabel(),
       'custom' => $this->t('Custom'),
     ];
 
@@ -127,6 +129,9 @@ public function viewElements(FieldItemListInterface $items) {
       if ($format == 'custom') {
         $elements[$delta] = ['#markup' => $item->value ? $this->getSetting('format_custom_true') : $this->getSetting('format_custom_false')];
       }
+      elseif ($format == 'label') {
+        $elements[$delta] = ['#markup' => $item->value ? SafeMarkup::checkPlain($this->fieldDefinition->getLabel()) : ''];
+      }
       else {
         $elements[$delta] = ['#markup' => $item->value ? $formats[$format][0] : $formats[$format][1]];
       }
diff --git a/core/modules/field/src/Tests/Boolean/BooleanFormatterSettingsTest.php b/core/modules/field/src/Tests/Boolean/BooleanFormatterSettingsTest.php
index e9b693d..5b38057 100644
--- a/core/modules/field/src/Tests/Boolean/BooleanFormatterSettingsTest.php
+++ b/core/modules/field/src/Tests/Boolean/BooleanFormatterSettingsTest.php
@@ -44,6 +44,13 @@ class BooleanFormatterSettingsTest extends WebTestBase {
   protected $fieldName;
 
   /**
+   * The field instance label.
+   *
+   * @var string
+   */
+  protected $label;
+
+  /**
    * {@inheritdoc}
    */
   protected function setUp() {
@@ -66,10 +73,11 @@ protected function setUp() {
     ]);
     $field_storage->save();
 
+    $this->label = $this->randomMachineName();
     $instance = FieldConfig::create([
       'field_storage' => $field_storage,
       'bundle' => $this->bundle,
-      'label' => $this->randomMachineName(),
+      'label' => $this->label,
     ]);
     $instance->save();
 
@@ -95,6 +103,7 @@ function testBooleanFormatterSettings() {
       'Enabled / Disabled',
       '1 / 0',
       'Custom',
+      $this->label,
     );
 
     // Define what the "default" option should look like, depending on the
diff --git a/core/modules/field/src/Tests/Boolean/BooleanFormatterTest.php b/core/modules/field/src/Tests/Boolean/BooleanFormatterTest.php
index 214590d..8589adc 100644
--- a/core/modules/field/src/Tests/Boolean/BooleanFormatterTest.php
+++ b/core/modules/field/src/Tests/Boolean/BooleanFormatterTest.php
@@ -50,6 +50,13 @@ class BooleanFormatterTest extends KernelTestBase {
   protected $display;
 
   /**
+   * Field instance label.
+   *
+   * @var string
+   */
+  protected $label;
+
+  /**
    * {@inheritdoc}
    */
   protected function setUp() {
@@ -69,10 +76,11 @@ protected function setUp() {
     ]);
     $field_storage->save();
 
+    $this->label = $this->randomMachineName();
     $instance = FieldConfig::create([
       'field_storage' => $field_storage,
       'bundle' => $this->bundle,
-      'label' => $this->randomMachineName(),
+      'label' => $this->label,
     ]);
     $instance->save();
 
@@ -117,6 +125,10 @@ public function testBooleanFormatter() {
     $data[] = [1, $format, '✔'];
     $data[] = [0, $format, '✖'];
 
+    $format = ['format' => 'label'];
+    // @todo test for empty value for 0 result?
+    $data[] = [1, $format, $this->label];
+
     $format = [
       'format' => 'custom',
       'format_custom_false' => 'FALSE',
diff --git a/core/modules/system/src/Tests/Common/AttachedAssetsTest.php b/core/modules/system/src/Tests/Common/AttachedAssetsTest.php
index a9701ff..a731b04 100644
--- a/core/modules/system/src/Tests/Common/AttachedAssetsTest.php
+++ b/core/modules/system/src/Tests/Common/AttachedAssetsTest.php
@@ -45,7 +45,7 @@ class AttachedAssetsTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('language', 'simpletest', 'common_test', 'system');
+  public static $modules = ['language', 'simpletest', 'common_test', 'system'];
 
   /**
    * {@inheritdoc}
@@ -392,6 +392,11 @@ function testRenderDifferentWeight() {
    * @see simpletest_js_alter()
    */
   function testAlter() {
+    // Ensure the locale module's js alter works with external sources.
+    $this->enableModules(['locale']);
+    $this->installSchema('locale', ['locales_source', 'locales_location']);
+    $build['#attached']['library'][] = 'common_test/external';
+
     // Add both tableselect.js and simpletest.js.
     $build['#attached']['library'][] = 'core/drupal.tableselect';
     $build['#attached']['library'][] = 'simpletest/drupal.simpletest';
diff --git a/core/modules/views/src/Tests/Handler/FieldBooleanTest.php b/core/modules/views/src/Tests/Handler/FieldBooleanTest.php
index 27b8165..b8a8165 100644
--- a/core/modules/views/src/Tests/Handler/FieldBooleanTest.php
+++ b/core/modules/views/src/Tests/Handler/FieldBooleanTest.php
@@ -35,6 +35,7 @@ function dataSet() {
   function viewsData() {
     $data = parent::viewsData();
     $data['views_test_data']['age']['field']['id'] = 'boolean';
+    $data['views_test_data']['age']['field']['label'] = 'Foo';
     return $data;
   }
 
@@ -69,11 +70,17 @@ public function testFieldBoolean() {
     $this->assertEqual(t('False'), $view->field['age']->advancedRender($view->result[0]));
     $this->assertEqual(t('True'), $view->field['age']->advancedRender($view->result[1]));
 
-    // test awesome unicode.
+    // Test awesome unicode.
     $view->field['age']->options['type'] = 'unicode-yes-no';
     $this->assertEqual('✖', $view->field['age']->advancedRender($view->result[0]));
     $this->assertEqual('✔', $view->field['age']->advancedRender($view->result[1]));
 
+    // Test label.
+    $view->field['age']->formats['label'] = ['Foo bar', ''];
+    $view->field['age']->options['type'] = 'label';
+    $this->assertEqual('', $view->field['age']->advancedRender($view->result[0]));
+    $this->assertEqual('Foo bar', $view->field['age']->advancedRender($view->result[1]));
+
     // Set a custom output format.
     $view->field['age']->formats['test'] = array(t('Test-True'), t('Test-False'));
     $view->field['age']->options['type'] = 'test';