diff -u b/core/modules/entity_reference/src/Tests/EntityReferenceFieldUntranslatedReferenceViewTest.php b/core/modules/entity_reference/src/Tests/EntityReferenceFieldUntranslatedReferenceViewTest.php
--- b/core/modules/entity_reference/src/Tests/EntityReferenceFieldUntranslatedReferenceViewTest.php
+++ b/core/modules/entity_reference/src/Tests/EntityReferenceFieldUntranslatedReferenceViewTest.php
@@ -7,13 +7,13 @@
 
 namespace Drupal\entity_reference\Tests;
 
-
 /**
  * Tests the translation of entity reference untranslated field display on nodes.
  *
  * @group entity_reference
  */
 class EntityReferenceFieldUntranslatedReferenceViewTest extends EntityReferenceFieldTranslatedReferenceViewTest {
+
   /**
    * Flag indicating whether the field is translatable.
    *
only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/Field/FormatterInterface.php
+++ b/core/lib/Drupal/Core/Field/FormatterInterface.php
@@ -69,11 +69,14 @@ public function prepareView(array $entities_items);
    *
    * @param \Drupal\Core\Field\FieldItemListInterface $items
    *   The field values to be rendered.
+   * @param $langcode
+   *   (optional) The language that should be used to render the field. Defaults
+   *   to the current content language.
    *
    * @return array
    *   A renderable array for a themed field with its label and all its values.
    */
-  public function view(FieldItemListInterface $items);
+  public function view(FieldItemListInterface $items, $langcode = NULL);
 
   /**
    * Builds a renderable array for a field value.