diff --git a/core/modules/hal/lib/Drupal/hal/Normalizer/FieldNormalizer.php b/core/modules/hal/lib/Drupal/hal/Normalizer/FieldNormalizer.php
index f928633..d898815 100644
--- a/core/modules/hal/lib/Drupal/hal/Normalizer/FieldNormalizer.php
+++ b/core/modules/hal/lib/Drupal/hal/Normalizer/FieldNormalizer.php
@@ -45,8 +45,8 @@ public function normalize($field, $format = NULL, array $context = array()) {
     // to the field item values.
     else {
       foreach ($entity->getTranslationLanguages() as $language) {
-        $context['langcode'] = $language->id;
-        $translation = $entity->getTranslation($language->id);
+        $context['langcode'] = $language->getId();
+        $translation = $entity->getTranslation($language->getId());
         $translated_field = $translation->get($field_name);
         $normalized_field_items = array_merge($normalized_field_items, $this->normalizeFieldItems($translated_field, $format, $context));
       }
diff --git a/core/modules/language/language.module b/core/modules/language/language.module
index 7e3e1d9..efbf47d 100644
--- a/core/modules/language/language.module
+++ b/core/modules/language/language.module
@@ -461,7 +461,7 @@ function language_save(LanguageInterface $language) {
  */
 function language_delete($langcode) {
   $languages = \Drupal::languageManager()->getLanguages(LanguageInterface::STATE_ALL);
-  if (isset($languages[$langcode]) && !$languages[$langcode]->locked) {
+  if (isset($languages[$langcode]) && !$languages[$langcode]->isLocked()) {
     $language = $languages[$langcode];
 
     // Remove the language.
@@ -663,7 +663,7 @@ function language_form_system_regional_settings_alter(&$form, &$form_state) {
   $languages = \Drupal::languageManager()->getLanguages();
   $default = \Drupal::languageManager()->getDefaultLanguage();
   foreach ($languages as $key => $language) {
-    $language_options[$key] = $language->name;
+    $language_options[$key] = $language->getName();
   }
   $form['locale']['site_default_language'] = array(
     '#type' => 'select',
diff --git a/core/modules/language/lib/Drupal/language/Form/LanguageDeleteForm.php b/core/modules/language/lib/Drupal/language/Form/LanguageDeleteForm.php
index 241bbe7..6edb8aa 100644
--- a/core/modules/language/lib/Drupal/language/Form/LanguageDeleteForm.php
+++ b/core/modules/language/lib/Drupal/language/Form/LanguageDeleteForm.php
@@ -89,7 +89,7 @@ public function buildForm(array $form, array &$form_state) {
     $langcode = $this->entity->id();
 
     // Warn and redirect user when attempting to delete the default language.
-    if (language_default()->id == $langcode) {
+    if (language_default()->getId() == $langcode) {
       drupal_set_message($this->t('The default language cannot be deleted.'));
       $url = $this->urlGenerator->generateFromPath('admin/config/regional/language', array('absolute' => TRUE));
       return new RedirectResponse($url);
diff --git a/core/modules/language/lib/Drupal/language/LanguageListBuilder.php b/core/modules/language/lib/Drupal/language/LanguageListBuilder.php
index c5bd66a..36209c5 100644
--- a/core/modules/language/lib/Drupal/language/LanguageListBuilder.php
+++ b/core/modules/language/lib/Drupal/language/LanguageListBuilder.php
@@ -49,7 +49,7 @@ public function getDefaultOperations(EntityInterface $entity) {
     $default = language_default();
 
     // Deleting the site default language is not allowed.
-    if ($entity->id() == $default->id) {
+    if ($entity->id() == $default->getId()) {
       unset($operations['delete']);
     }