diff --git a/core/includes/entity.inc b/core/includes/entity.inc
index 52ae51e..d79381a 100644
--- a/core/includes/entity.inc
+++ b/core/includes/entity.inc
@@ -360,7 +360,7 @@ function entity_page_label(EntityInterface $entity, $langcode = NULL) {
 function entity_view(EntityInterface $entity, $view_mode, $langcode = NULL, $reset = FALSE) {
   $render_controller = \Drupal::entityManager()->getViewBuilder($entity->getEntityTypeId());
   if ($reset) {
-    $render_controller->resetCache(array($entity->id()));
+    $render_controller->resetCache([$entity]);
   }
   return $render_controller->view($entity, $view_mode, $langcode);
 }
@@ -397,7 +397,7 @@ function entity_view(EntityInterface $entity, $view_mode, $langcode = NULL, $res
 function entity_view_multiple(array $entities, $view_mode, $langcode = NULL, $reset = FALSE) {
   $render_controller = \Drupal::entityManager()->getViewBuilder(reset($entities)->getEntityTypeId());
   if ($reset) {
-    $render_controller->resetCache(array_keys($entities));
+    $render_controller->resetCache($entities);
   }
   return $render_controller->viewMultiple($entities, $view_mode, $langcode);
 }
diff --git a/core/lib/Drupal/Core/Entity/Controller/EntityViewController.php b/core/lib/Drupal/Core/Entity/Controller/EntityViewController.php
index 8ddf063..d416e3a 100644
--- a/core/lib/Drupal/Core/Entity/Controller/EntityViewController.php
+++ b/core/lib/Drupal/Core/Entity/Controller/EntityViewController.php
@@ -91,17 +91,14 @@ public function buildTitle(array $page) {
    * @param string $view_mode
    *   (optional) The view mode that should be used to display the entity.
    *   Defaults to 'full'.
-   * @param string $langcode
-   *   (optional) For which language the entity should be rendered, defaults to
-   *   the current content language.
    *
    * @return array
    *   A render array as expected by drupal_render().
    */
-  public function view(EntityInterface $_entity, $view_mode = 'full', $langcode = NULL) {
+  public function view(EntityInterface $_entity, $view_mode = 'full') {
     $page = $this->entityManager
       ->getViewBuilder($_entity->getEntityTypeId())
-      ->view($_entity, $view_mode, $langcode);
+      ->view($_entity, $view_mode);
 
     $page['#pre_render'][] = [$this, 'buildTitle'];
     $page['#entity_type'] = $_entity->getEntityTypeId();
diff --git a/core/lib/Drupal/Core/Entity/EntityViewBuilder.php b/core/lib/Drupal/Core/Entity/EntityViewBuilder.php
index 2fcdce5..d212474 100644
--- a/core/lib/Drupal/Core/Entity/EntityViewBuilder.php
+++ b/core/lib/Drupal/Core/Entity/EntityViewBuilder.php
@@ -12,10 +12,9 @@
 use Drupal\Core\Entity\Entity\EntityViewDisplay;
 use Drupal\Core\Field\FieldItemInterface;
 use Drupal\Core\Field\FieldItemListInterface;
-use Drupal\Core\Language\LanguageInterface;
 use Drupal\Core\Language\LanguageManagerInterface;
-use Drupal\Core\TypedData\TranslatableInterface;
 use Drupal\Core\Render\Element;
+use Drupal\Core\TypedData\TranslatableInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
@@ -120,7 +119,6 @@ public function viewMultiple(array $entities = array(), $view_mode = 'full', $la
     $build_list = array(
       '#sorted' => TRUE,
       '#pre_render' => array(array($this, 'buildMultiple')),
-      '#langcode' => $langcode ?: $this->languageManager->getCurrentLanguage(LanguageInterface::TYPE_CONTENT)->getId(),
     );
     $weight = 0;
     foreach ($entities as $key => $entity) {
@@ -129,10 +127,9 @@ public function viewMultiple(array $entities = array(), $view_mode = 'full', $la
       $entity = $this->entityManager->getTranslationFromContext($entity, $langcode);
 
       // Set build defaults.
-      $entity_langcode = $entity->language()->getId();
-      $build_list[$key] = $this->getBuildDefaults($entity, $view_mode, $entity_langcode);
+      $build_list[$key] = $this->getBuildDefaults($entity, $view_mode);
       $entityType = $this->entityTypeId;
-      $this->moduleHandler()->alter(array($entityType . '_build_defaults', 'entity_build_defaults'), $build_list[$key], $entity, $view_mode, $entity_langcode);
+      $this->moduleHandler()->alter(array($entityType . '_build_defaults', 'entity_build_defaults'), $build_list[$key], $entity, $view_mode);
 
       $build_list[$key]['#weight'] = $weight++;
     }
@@ -147,22 +144,18 @@ public function viewMultiple(array $entities = array(), $view_mode = 'full', $la
    *   The entity for which the defaults should be provided.
    * @param string $view_mode
    *   The view mode that should be used.
-   * @param string $langcode
-   *   For which language the entity should be prepared, defaults to
-   *   the current content language.
    *
    * @return array
    */
-  protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langcode) {
+  protected function getBuildDefaults(EntityInterface $entity, $view_mode) {
     // Allow modules to change the view mode.
-    $context = array('langcode' => $langcode);
+    $context = [];
     $this->moduleHandler()->alter('entity_view_mode', $view_mode, $entity, $context);
 
     $build = array(
       '#theme' => $this->entityTypeId,
       "#{$this->entityTypeId}" => $entity,
       '#view_mode' => $view_mode,
-      '#langcode' => $langcode,
       // Collect cache defaults for this entity.
       '#cache' => array(
         'tags' => Cache::mergeTags($this->getCacheTags(), $entity->getCacheTags()),
@@ -185,7 +178,7 @@ protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langco
       );
 
       if ($entity instanceof TranslatableInterface && count($entity->getTranslationLanguages()) > 1) {
-        $build['#cache']['keys'][] = $langcode;
+        $build['#cache']['keys'][] = $entity->language()->getId();
       }
     }
 
@@ -211,10 +204,7 @@ protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langco
    * @see drupal_render()
    */
   public function build(array $build) {
-    $build_list = array(
-      '#langcode' => $build['#langcode'],
-    );
-    $build_list[] = $build;
+    $build_list = [$build];
     $build_list = $this->buildMultiple($build_list);
     return $build_list[0];
   }
@@ -240,7 +230,6 @@ public function build(array $build) {
   public function buildMultiple(array $build_list) {
     // Build the view modes and display objects.
     $view_modes = array();
-    $langcode = $build_list['#langcode'];
     $entity_type_key = "#{$this->entityTypeId}";
     $view_hook = "{$this->entityTypeId}_view";
 
@@ -259,16 +248,16 @@ public function buildMultiple(array $build_list) {
     // Build content for the displays represented by the entities.
     foreach ($view_modes as $view_mode => $view_mode_entities) {
       $displays = EntityViewDisplay::collectRenderDisplays($view_mode_entities, $view_mode);
-      $this->buildComponents($build_list, $view_mode_entities, $displays, $view_mode, $langcode);
+      $this->buildComponents($build_list, $view_mode_entities, $displays, $view_mode);
       foreach (array_keys($view_mode_entities) as $key) {
         // Allow for alterations while building, before rendering.
         $entity = $build_list[$key][$entity_type_key];
         $display = $displays[$entity->bundle()];
 
-        $this->moduleHandler()->invokeAll($view_hook, array(&$build_list[$key], $entity, $display, $view_mode, $langcode));
-        $this->moduleHandler()->invokeAll('entity_view', array(&$build_list[$key], $entity, $display, $view_mode, $langcode));
+        $this->moduleHandler()->invokeAll($view_hook, [&$build_list[$key], $entity, $display, $view_mode]);
+        $this->moduleHandler()->invokeAll('entity_view', [&$build_list[$key], $entity, $display, $view_mode]);
 
-        $this->alterBuild($build_list[$key], $entity, $display, $view_mode, $langcode);
+        $this->alterBuild($build_list[$key], $entity, $display, $view_mode);
 
         // Assign the weights configured in the display.
         // @todo: Once https://www.drupal.org/node/1875974 provides the missing
@@ -291,7 +280,7 @@ public function buildMultiple(array $build_list) {
   /**
    * {@inheritdoc}
    */
-  public function buildComponents(array &$build, array $entities, array $displays, $view_mode, $langcode = NULL) {
+  public function buildComponents(array &$build, array $entities, array $displays, $view_mode) {
     $entities_by_bundle = array();
     foreach ($entities as $id => $entity) {
       // Initialize the field item attributes for the fields being displayed.
@@ -335,11 +324,8 @@ public function buildComponents(array &$build, array $entities, array $displays,
    *   entity components.
    * @param string $view_mode
    *   The view mode that should be used to prepare the entity.
-   * @param string $langcode
-   *   (optional) For which language the entity should be prepared, defaults to
-   *   the current content language.
    */
-  protected function alterBuild(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode, $langcode = NULL) { }
+  protected function alterBuild(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode) { }
 
   /**
    * {@inheritdoc}
diff --git a/core/lib/Drupal/Core/Entity/EntityViewBuilderInterface.php b/core/lib/Drupal/Core/Entity/EntityViewBuilderInterface.php
index 0549060..eff6516 100644
--- a/core/lib/Drupal/Core/Entity/EntityViewBuilderInterface.php
+++ b/core/lib/Drupal/Core/Entity/EntityViewBuilderInterface.php
@@ -29,11 +29,8 @@
    *   configured for the entity components, keyed by bundle name.
    * @param string $view_mode
    *   The view mode in which the entity is being viewed.
-   * @param string $langcode
-   *   (optional) For which language the entity should be build, defaults to
-   *   the current content language.
    */
-  public function buildComponents(array &$build, array $entities, array $displays, $view_mode, $langcode = NULL);
+  public function buildComponents(array &$build, array $entities, array $displays, $view_mode);
 
   /**
    * Builds the render array for the provided entity.
diff --git a/core/lib/Drupal/Core/Entity/entity.api.php b/core/lib/Drupal/Core/Entity/entity.api.php
index f6ac384..37fcdff 100644
--- a/core/lib/Drupal/Core/Entity/entity.api.php
+++ b/core/lib/Drupal/Core/Entity/entity.api.php
@@ -468,7 +468,9 @@
  * @endcode
  * Then, to build and render the entity:
  * @code
- * // You can omit the language ID if the default language is being used.
+ * // You can omit the language ID, by default the current content language will
+ * // be used. If no translation is available for the current language, fallback
+ * // rules will be used.
  * $build = $view_builder->view($entity, 'view_mode_name', $language->getId());
  * // $build is a render array.
  * $rendered = drupal_render($build);
@@ -502,6 +504,7 @@
  *
  * @see i18n
  * @see entity_crud
+ * @see \Drupal\Core\Entity\EntityManagerInterface::getTranslationFromContext()
  * @}
  */
 
@@ -1232,8 +1235,6 @@ function hook_entity_query_alter(\Drupal\Core\Entity\Query\QueryInterface $query
  *   entity components.
  * @param $view_mode
  *   The view mode the entity is rendered in.
- * @param $langcode
- *   The language code used for rendering.
  *
  * The module may add elements to $build prior to rendering. The
  * structure of $build is a renderable array as expected by
@@ -1244,7 +1245,7 @@ function hook_entity_query_alter(\Drupal\Core\Entity\Query\QueryInterface $query
  *
  * @ingroup entity_crud
  */
-function hook_entity_view(array &$build, \Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display, $view_mode, $langcode) {
+function hook_entity_view(array &$build, \Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display, $view_mode) {
   // Only do the extra work if the component is configured to be displayed.
   // This assumes a 'mymodule_addition' extra field has been defined for the
   // entity bundle in hook_entity_extra_field_info().
@@ -1268,8 +1269,6 @@ function hook_entity_view(array &$build, \Drupal\Core\Entity\EntityInterface $en
  *   entity components.
  * @param $view_mode
  *   The view mode the entity is rendered in.
- * @param $langcode
- *   The language code used for rendering.
  *
  * The module may add elements to $build prior to rendering. The
  * structure of $build is a renderable array as expected by
@@ -1280,7 +1279,7 @@ function hook_entity_view(array &$build, \Drupal\Core\Entity\EntityInterface $en
  *
  * @ingroup entity_crud
  */
-function hook_ENTITY_TYPE_view(array &$build, \Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display, $view_mode, $langcode) {
+function hook_ENTITY_TYPE_view(array &$build, \Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display, $view_mode) {
   // Only do the extra work if the component is configured to be displayed.
   // This assumes a 'mymodule_addition' extra field has been defined for the
   // entity bundle in hook_entity_extra_field_info().
@@ -1443,8 +1442,6 @@ function hook_entity_view_mode_alter(&$view_mode, Drupal\Core\Entity\EntityInter
  *   The entity that is being viewed.
  * @param string $view_mode
  *   The view_mode that is to be used to display the entity.
- * @param string $langcode
- *   The code of the language $entity is accessed in.
  *
  * @see drupal_render()
  * @see \Drupal\Core\Entity\EntityViewBuilder
@@ -1452,7 +1449,7 @@ function hook_entity_view_mode_alter(&$view_mode, Drupal\Core\Entity\EntityInter
  *
  * @ingroup entity_crud
  */
-function hook_ENTITY_TYPE_build_defaults_alter(array &$build, \Drupal\Core\Entity\EntityInterface $entity, $view_mode, $langcode) {
+function hook_ENTITY_TYPE_build_defaults_alter(array &$build, \Drupal\Core\Entity\EntityInterface $entity, $view_mode) {
 
 }
 
@@ -1469,8 +1466,6 @@ function hook_ENTITY_TYPE_build_defaults_alter(array &$build, \Drupal\Core\Entit
  *   The entity that is being viewed.
  * @param string $view_mode
  *   The view_mode that is to be used to display the entity.
- * @param string $langcode
- *   The code of the language $entity is accessed in.
  *
  * @see drupal_render()
  * @see \Drupal\Core\Entity\EntityViewBuilder
@@ -1478,7 +1473,7 @@ function hook_ENTITY_TYPE_build_defaults_alter(array &$build, \Drupal\Core\Entit
  *
  * @ingroup entity_crud
  */
-function hook_entity_build_defaults_alter(array &$build, \Drupal\Core\Entity\EntityInterface $entity, $view_mode, $langcode) {
+function hook_entity_build_defaults_alter(array &$build, \Drupal\Core\Entity\EntityInterface $entity, $view_mode) {
 
 }
 
diff --git a/core/modules/aggregator/src/FeedViewBuilder.php b/core/modules/aggregator/src/FeedViewBuilder.php
index d631790..11b78ab 100644
--- a/core/modules/aggregator/src/FeedViewBuilder.php
+++ b/core/modules/aggregator/src/FeedViewBuilder.php
@@ -52,8 +52,8 @@ public static function createInstance(ContainerInterface $container, EntityTypeI
   /**
    * {@inheritdoc}
    */
-  public function buildComponents(array &$build, array $entities, array $displays, $view_mode, $langcode = NULL) {
-    parent::buildComponents($build, $entities, $displays, $view_mode, $langcode);
+  public function buildComponents(array &$build, array $entities, array $displays, $view_mode) {
+    parent::buildComponents($build, $entities, $displays, $view_mode);
 
     foreach ($entities as $id => $entity) {
       $bundle = $entity->bundle();
@@ -69,7 +69,7 @@ public function buildComponents(array &$build, array $entities, array $displays,
 
         $build[$id]['items'] = $this->entityManager
           ->getViewBuilder('aggregator_item')
-          ->viewMultiple($items, $view_mode, $langcode);
+          ->viewMultiple($items, $view_mode, $entity->language()->getId());
 
         if ($view_mode == 'full') {
           // Also add the pager.
diff --git a/core/modules/aggregator/src/ItemViewBuilder.php b/core/modules/aggregator/src/ItemViewBuilder.php
index c43cddd..1f0c23a 100644
--- a/core/modules/aggregator/src/ItemViewBuilder.php
+++ b/core/modules/aggregator/src/ItemViewBuilder.php
@@ -17,8 +17,8 @@ class ItemViewBuilder extends EntityViewBuilder {
   /**
    * {@inheritdoc}
    */
-  public function buildComponents(array &$build, array $entities, array $displays, $view_mode, $langcode = NULL) {
-    parent::buildComponents($build, $entities, $displays, $view_mode, $langcode);
+  public function buildComponents(array &$build, array $entities, array $displays, $view_mode) {
+    parent::buildComponents($build, $entities, $displays, $view_mode);
 
     foreach ($entities as $id => $entity) {
       $bundle = $entity->bundle();
diff --git a/core/modules/block/src/BlockViewBuilder.php b/core/modules/block/src/BlockViewBuilder.php
index f23979d..b05cf23 100644
--- a/core/modules/block/src/BlockViewBuilder.php
+++ b/core/modules/block/src/BlockViewBuilder.php
@@ -65,7 +65,7 @@ public static function createInstance(ContainerInterface $container, EntityTypeI
   /**
    * {@inheritdoc}
    */
-  public function buildComponents(array &$build, array $entities, array $displays, $view_mode, $langcode = NULL) {
+  public function buildComponents(array &$build, array $entities, array $displays, $view_mode) {
   }
 
   /**
@@ -192,7 +192,7 @@ protected static function buildPreRenderableBlock($entity, ModuleHandlerInterfac
    * @return array
    *   A render array with a #pre_render callback to render the block.
    */
-  public static function lazyBuilder($entity_id, $view_mode, $langcode) {
+  public static function lazyBuilder($entity_id, $view_mode) {
     return static::buildPreRenderableBlock(entity_load('block', $entity_id), \Drupal::service('module_handler'));
   }
 
diff --git a/core/modules/block_content/src/BlockContentViewBuilder.php b/core/modules/block_content/src/BlockContentViewBuilder.php
index 915d690..87b7aed 100644
--- a/core/modules/block_content/src/BlockContentViewBuilder.php
+++ b/core/modules/block_content/src/BlockContentViewBuilder.php
@@ -38,8 +38,8 @@ public function viewMultiple(array $entities = array(), $view_mode = 'full', $la
   /**
    * {@inheritdoc}
    */
-  protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langcode) {
-    $build = parent::getBuildDefaults($entity, $view_mode, $langcode);
+  protected function getBuildDefaults(EntityInterface $entity, $view_mode) {
+    $build = parent::getBuildDefaults($entity, $view_mode);
     // The custom block will be rendered in the wrapped block template already
     // and thus has no entity template itself.
     unset($build['#theme']);
@@ -49,8 +49,8 @@ protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langco
   /**
    * {@inheritdoc}
    */
-  protected function alterBuild(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode, $langcode = NULL) {
-    parent::alterBuild($build, $entity, $display, $view_mode, $langcode);
+  protected function alterBuild(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode) {
+    parent::alterBuild($build, $entity, $display, $view_mode);
     // Add contextual links for this custom block.
     if (!$entity->isNew()) {
       $build['#contextual_links']['block_content'] = array(
diff --git a/core/modules/comment/comment.module b/core/modules/comment/comment.module
index f96a5b9..4fcb7de 100644
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -215,7 +215,7 @@ function comment_node_links_alter(array &$node_links, NodeInterface $node, array
 /**
  * Implements hook_entity_view().
  */
-function comment_entity_view(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode, $langcode) {
+function comment_entity_view(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode) {
   if ($entity instanceof FieldableEntityInterface && $view_mode == 'rss' && $display->getComponent('links')) {
     /** @var \Drupal\comment\CommentManagerInterface $comment_manager */
     $comment_manager = \Drupal::service('comment.manager');
@@ -426,7 +426,7 @@ function _comment_entity_uses_integer_id($entity_type_id) {
 /**
  * Implements hook_node_update_index().
  */
-function comment_node_update_index(EntityInterface $node, $langcode) {
+function comment_node_update_index(EntityInterface $node) {
   $index_comments = &drupal_static(__FUNCTION__);
 
   if ($index_comments === NULL) {
diff --git a/core/modules/comment/src/CommentViewBuilder.php b/core/modules/comment/src/CommentViewBuilder.php
index 66bb193..f17649e 100644
--- a/core/modules/comment/src/CommentViewBuilder.php
+++ b/core/modules/comment/src/CommentViewBuilder.php
@@ -62,8 +62,8 @@ public static function createInstance(ContainerInterface $container, EntityTypeI
   /**
    * {@inheritdoc}
    */
-  protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langcode) {
-    $build = parent::getBuildDefaults($entity, $view_mode, $langcode);
+  protected function getBuildDefaults(EntityInterface $entity, $view_mode) {
+    $build = parent::getBuildDefaults($entity, $view_mode);
 
     /** @var \Drupal\comment\CommentInterface $entity */
     // Store a threading field setting to use later in self::buildComponents().
@@ -88,7 +88,7 @@ protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langco
    * @throws \InvalidArgumentException
    *   Thrown when a comment is attached to an entity that no longer exists.
    */
-  public function buildComponents(array &$build, array $entities, array $displays, $view_mode, $langcode = NULL) {
+  public function buildComponents(array &$build, array $entities, array $displays, $view_mode) {
     /** @var \Drupal\comment\CommentInterface[] $entities */
     if (empty($entities)) {
       return;
@@ -101,7 +101,7 @@ public function buildComponents(array &$build, array $entities, array $displays,
     }
     $this->entityManager->getStorage('user')->loadMultiple(array_unique($uids));
 
-    parent::buildComponents($build, $entities, $displays, $view_mode, $langcode);
+    parent::buildComponents($build, $entities, $displays, $view_mode);
 
     // A counter to track the indentation level.
     $current_indent = 0;
@@ -136,7 +136,7 @@ public function buildComponents(array &$build, array $entities, array $displays,
           '#lazy_builder' => ['comment.lazy_builders:renderLinks', [
             $entity->id(),
             $view_mode,
-            $langcode,
+            $entity->language()->getId(),
             !empty($entity->in_preview),
           ]],
           '#create_placeholder' => TRUE,
@@ -166,8 +166,8 @@ public function buildComponents(array &$build, array $entities, array $displays,
   /**
    * {@inheritdoc}
    */
-  protected function alterBuild(array &$build, EntityInterface $comment, EntityViewDisplayInterface $display, $view_mode, $langcode = NULL) {
-    parent::alterBuild($build, $comment, $display, $view_mode, $langcode);
+  protected function alterBuild(array &$build, EntityInterface $comment, EntityViewDisplayInterface $display, $view_mode) {
+    parent::alterBuild($build, $comment, $display, $view_mode);
     if (empty($comment->in_preview)) {
       $prefix = '';
 
diff --git a/core/modules/contact/contact.module b/core/modules/contact/contact.module
index a3e47b3..46b131d 100644
--- a/core/modules/contact/contact.module
+++ b/core/modules/contact/contact.module
@@ -142,7 +142,7 @@ function contact_mail($key, &$message, $params) {
     case 'page_copy':
       $message['subject'] .= t('[@form] @subject', $variables, $options);
       $message['body'][] = t("@sender-name (@sender-url) sent a message using the contact form at @form-url.", $variables, $options);
-      $build = entity_view($contact_message, 'mail', $language->getId());
+      $build = entity_view($contact_message, 'mail');
       $message['body'][] = (string) \Drupal::service('renderer')->renderPlain($build);
       break;
 
@@ -161,7 +161,7 @@ function contact_mail($key, &$message, $params) {
       $message['body'][] = t('Hello @recipient-name,', $variables, $options);
       $message['body'][] = t("@sender-name (@sender-url) has sent you a message via your contact form at @site-name.", $variables, $options);
       $message['body'][] = t("If you don't want to receive such emails, you can change your settings at @recipient-edit-url.", $variables, $options);
-      $build = entity_view($contact_message, 'mail', $language->getId());
+      $build = entity_view($contact_message, 'mail');
       $message['body'][] = (string) \Drupal::service('renderer')->renderPlain($build);
       break;
   }
diff --git a/core/modules/contact/src/MessageViewBuilder.php b/core/modules/contact/src/MessageViewBuilder.php
index def70f9..66c6873 100644
--- a/core/modules/contact/src/MessageViewBuilder.php
+++ b/core/modules/contact/src/MessageViewBuilder.php
@@ -20,8 +20,8 @@ class MessageViewBuilder extends EntityViewBuilder {
   /**
    * {@inheritdoc}
    */
-  protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langcode) {
-    $build = parent::getBuildDefaults($entity, $view_mode, $langcode);
+  protected function getBuildDefaults(EntityInterface $entity, $view_mode) {
+    $build = parent::getBuildDefaults($entity, $view_mode);
     // The message fields are individually rendered into email templates, so
     // the entity has no template itself.
     unset($build['#theme']);
@@ -31,8 +31,8 @@ protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langco
   /**
    * {@inheritdoc}
    */
-  public function buildComponents(array &$build, array $entities, array $displays, $view_mode, $langcode = NULL) {
-    parent::buildComponents($build, $entities, $displays, $view_mode, $langcode);
+  public function buildComponents(array &$build, array $entities, array $displays, $view_mode) {
+    parent::buildComponents($build, $entities, $displays, $view_mode);
 
     foreach ($entities as $id => $entity) {
       // Add the message extra field, if enabled.
diff --git a/core/modules/node/node.api.php b/core/modules/node/node.api.php
index 132f72a..55265d6 100644
--- a/core/modules/node/node.api.php
+++ b/core/modules/node/node.api.php
@@ -364,8 +364,6 @@ function hook_node_access(\Drupal\node\NodeInterface $node, $op, \Drupal\Core\Se
  *
  * @param \Drupal\node\NodeInterface $node
  *   The node being displayed in a search result.
- * @param string $langcode
- *   Language code of result being displayed.
  *
  * @return array
  *   Extra information to be displayed with search result. This information
@@ -378,7 +376,7 @@ function hook_node_access(\Drupal\node\NodeInterface $node, $op, \Drupal\Core\Se
  *
  * @ingroup entity_crud
  */
-function hook_node_search_result(\Drupal\node\NodeInterface $node, $langcode) {
+function hook_node_search_result(\Drupal\node\NodeInterface $node) {
   $rating = db_query('SELECT SUM(points) FROM {my_rating} WHERE nid = :nid', array('nid' => $node->id()))->fetchField();
   return array('rating' => \Drupal::translation()->formatPlural($rating, '1 point', '@count points'));
 }
@@ -391,15 +389,13 @@ function hook_node_search_result(\Drupal\node\NodeInterface $node, $langcode) {
  *
  * @param \Drupal\node\NodeInterface $node
  *   The node being indexed.
- * @param string $langcode
- *   Language code of the variant of the node being indexed.
  *
  * @return string
  *   Additional node information to be indexed.
  *
  * @ingroup entity_crud
  */
-function hook_node_update_index(\Drupal\node\NodeInterface $node, $langcode) {
+function hook_node_update_index(\Drupal\node\NodeInterface $node) {
   $text = '';
   $ratings = db_query('SELECT title, description FROM {my_ratings} WHERE nid = :nid', array(':nid' => $node->id()));
   foreach ($ratings as $rating) {
diff --git a/core/modules/node/src/NodeViewBuilder.php b/core/modules/node/src/NodeViewBuilder.php
index 3f3420c..dd7c045 100644
--- a/core/modules/node/src/NodeViewBuilder.php
+++ b/core/modules/node/src/NodeViewBuilder.php
@@ -21,13 +21,13 @@ class NodeViewBuilder extends EntityViewBuilder {
   /**
    * {@inheritdoc}
    */
-  public function buildComponents(array &$build, array $entities, array $displays, $view_mode, $langcode = NULL) {
+  public function buildComponents(array &$build, array $entities, array $displays, $view_mode) {
     /** @var \Drupal\node\NodeInterface[] $entities */
     if (empty($entities)) {
       return;
     }
 
-    parent::buildComponents($build, $entities, $displays, $view_mode, $langcode);
+    parent::buildComponents($build, $entities, $displays, $view_mode);
 
     foreach ($entities as $id => $entity) {
       $bundle = $entity->bundle();
@@ -38,7 +38,7 @@ public function buildComponents(array &$build, array $entities, array $displays,
           '#lazy_builder' => [get_called_class() . '::renderLinks', [
             $entity->id(),
             $view_mode,
-            $langcode,
+            $entity->language()->getId(),
             !empty($entity->in_preview),
           ]],
         );
@@ -60,8 +60,8 @@ public function buildComponents(array &$build, array $entities, array $displays,
   /**
    * {@inheritdoc}
    */
-  protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langcode) {
-    $defaults = parent::getBuildDefaults($entity, $view_mode, $langcode);
+  protected function getBuildDefaults(EntityInterface $entity, $view_mode) {
+    $defaults = parent::getBuildDefaults($entity, $view_mode);
 
     // Don't cache nodes that are in 'preview' mode.
     if (isset($defaults['#cache']) && isset($entity->in_preview)) {
@@ -148,9 +148,9 @@ protected static function buildLinks(NodeInterface $entity, $view_mode) {
   /**
    * {@inheritdoc}
    */
-  protected function alterBuild(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode, $langcode = NULL) {
+  protected function alterBuild(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode) {
     /** @var \Drupal\node\NodeInterface $entity */
-    parent::alterBuild($build, $entity, $display, $view_mode, $langcode);
+    parent::alterBuild($build, $entity, $display, $view_mode);
     if ($entity->id()) {
       $build['#contextual_links']['node'] = array(
         'route_parameters' =>array('node' => $entity->id()),
diff --git a/core/modules/node/src/Plugin/Search/NodeSearch.php b/core/modules/node/src/Plugin/Search/NodeSearch.php
index 97ae236..8861521 100644
--- a/core/modules/node/src/Plugin/Search/NodeSearch.php
+++ b/core/modules/node/src/Plugin/Search/NodeSearch.php
@@ -337,9 +337,9 @@ protected function prepareResults(StatementInterface $found) {
       // Fetch comments for snippet.
       $rendered = $this->renderer->renderPlain($build);
       $this->addCacheableDependency(CacheableMetadata::createFromRenderArray($build));
-      $rendered .= ' ' . $this->moduleHandler->invoke('comment', 'node_update_index', array($node, $item->langcode));
+      $rendered .= ' ' . $this->moduleHandler->invoke('comment', 'node_update_index', [$node]);
 
-      $extra = $this->moduleHandler->invokeAll('node_search_result', array($node, $item->langcode));
+      $extra = $this->moduleHandler->invokeAll('node_search_result', [$node]);
 
       $language = $this->languageManager->getLanguage($item->langcode);
       $username = array(
@@ -461,14 +461,14 @@ protected function indexNode(NodeInterface $node) {
       // Add the title to text so it is searchable.
       $build['search_title'] = [
         '#prefix' => '<h1>',
-        '#plain_text' => $node->label($language->getId()),
+        '#plain_text' => $node->label(),
         '#suffix' => '</h1>',
         '#weight' => -1000
       ];
       $text = $this->renderer->renderPlain($build);
 
       // Fetch extra data normally not visible.
-      $extra = $this->moduleHandler->invokeAll('node_update_index', array($node, $language->getId()));
+      $extra = $this->moduleHandler->invokeAll('node_update_index', [$node]);
       foreach ($extra as $t) {
         $text .= $t;
       }
diff --git a/core/modules/node/tests/modules/node_test/node_test.module b/core/modules/node/tests/modules/node_test/node_test.module
index b78e489..aa7d4dd 100644
--- a/core/modules/node/tests/modules/node_test/node_test.module
+++ b/core/modules/node/tests/modules/node_test/node_test.module
@@ -41,7 +41,7 @@ function node_test_node_view(array &$build, NodeInterface $node, EntityViewDispl
 /**
  * Implements hook_ENTITY_TYPE_build_defaults_alter() for node entities.
  */
-function node_test_node_build_defaults_alter(array &$build, NodeInterface &$node, $view_mode = 'full', $langcode = NULL) {
+function node_test_node_build_defaults_alter(array &$build, NodeInterface &$node, $view_mode = 'full') {
   if ($view_mode == 'rss') {
     $node->rss_namespaces['xmlns:drupaltest'] = 'http://example.com/test-namespace';
   }
diff --git a/core/modules/system/tests/modules/entity_test/src/EntityTestViewBuilder.php b/core/modules/system/tests/modules/entity_test/src/EntityTestViewBuilder.php
index e1042e9..6ba30d1 100644
--- a/core/modules/system/tests/modules/entity_test/src/EntityTestViewBuilder.php
+++ b/core/modules/system/tests/modules/entity_test/src/EntityTestViewBuilder.php
@@ -20,8 +20,8 @@ class EntityTestViewBuilder extends EntityViewBuilder {
   /**
    * {@inheritdoc}
    */
-  protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langcode) {
-    $build = parent::getBuildDefaults($entity, $view_mode, $langcode);
+  protected function getBuildDefaults(EntityInterface $entity, $view_mode) {
+    $build = parent::getBuildDefaults($entity, $view_mode);
     unset($build['#theme']);
     return $build;
   }
@@ -29,8 +29,8 @@ protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langco
   /**
    * {@inheritdoc}
    */
-  public function buildComponents(array &$build, array $entities, array $displays, $view_mode, $langcode = NULL) {
-    parent::buildComponents($build, $entities, $displays, $view_mode, $langcode);
+  public function buildComponents(array &$build, array $entities, array $displays, $view_mode) {
+    parent::buildComponents($build, $entities, $displays, $view_mode);
 
     foreach ($entities as $id => $entity) {
       $build[$id]['label'] = array(
diff --git a/core/modules/taxonomy/src/TermViewBuilder.php b/core/modules/taxonomy/src/TermViewBuilder.php
index 767529c..efd4374 100644
--- a/core/modules/taxonomy/src/TermViewBuilder.php
+++ b/core/modules/taxonomy/src/TermViewBuilder.php
@@ -19,8 +19,8 @@ class TermViewBuilder extends EntityViewBuilder {
   /**
    * {@inheritdoc}
    */
-  protected function alterBuild(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode, $langcode = NULL) {
-    parent::alterBuild($build, $entity, $display, $view_mode, $langcode);
+  protected function alterBuild(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode) {
+    parent::alterBuild($build, $entity, $display, $view_mode);
     $build['#contextual_links']['taxonomy_term'] = array(
       'route_parameters' => array('taxonomy_term' => $entity->id()),
       'metadata' => array('changed' => $entity->getChangedTime()),
diff --git a/core/modules/text/src/TextProcessed.php b/core/modules/text/src/TextProcessed.php
index d41cb92..197b28c 100644
--- a/core/modules/text/src/TextProcessed.php
+++ b/core/modules/text/src/TextProcessed.php
@@ -41,7 +41,7 @@ public function __construct(DataDefinitionInterface $definition, $name = NULL, T
   /**
    * Implements \Drupal\Core\TypedData\TypedDataInterface::getValue().
    */
-  public function getValue($langcode = NULL) {
+  public function getValue() {
     if ($this->processed !== NULL) {
       return $this->processed;
     }