diff --git a/core/lib/Drupal/Core/Config/StorableConfigBase.php b/core/lib/Drupal/Core/Config/StorableConfigBase.php
index 5c6e8b3..b9de0b6 100644
--- a/core/lib/Drupal/Core/Config/StorableConfigBase.php
+++ b/core/lib/Drupal/Core/Config/StorableConfigBase.php
@@ -9,6 +9,7 @@
 
 use Drupal\Component\Utility\String;
 use Drupal\Core\Config\Schema\Ignore;
+use Drupal\Core\StringTranslation\TranslationWrapper;
 use Drupal\Core\TypedData\PrimitiveInterface;
 use Drupal\Core\TypedData\Type\FloatInterface;
 use Drupal\Core\TypedData\Type\IntegerInterface;
@@ -184,6 +185,10 @@ protected function castValue($key, $value) {
       $this->validateValue($key, $value);
       return $value;
     }
+    // Support translation wrappers.
+    if ($value instanceof TranslationWrapper) {
+      $value = (string) $value;
+    }
     if (is_scalar($value) || $value === NULL) {
       if ($element && $element instanceof PrimitiveInterface) {
         // Special handling for integers and floats since the configuration
diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index 8514448..5dd1340 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -636,6 +636,9 @@ public function updateModules(array $module_list, array $module_filenames = arra
     // and container.
     if ($this->booted) {
       $this->initializeContainer(TRUE);
+      if ($this->containerNeedsDumping && !$this->dumpDrupalContainer($this->container, static::CONTAINER_BASE_CLASS)) {
+        $this->container->get('logger.factory')->get('DrupalKernel')->notice('Container cannot be written to disk');
+      }
     }
   }
 
diff --git a/core/lib/Drupal/Core/Entity/EntityManager.php b/core/lib/Drupal/Core/Entity/EntityManager.php
index 94fe169..c794d93 100644
--- a/core/lib/Drupal/Core/Entity/EntityManager.php
+++ b/core/lib/Drupal/Core/Entity/EntityManager.php
@@ -698,7 +698,7 @@ public function getAllBundleInfo() {
         foreach ($this->getDefinitions() as $type => $entity_type) {
           // If no bundles are provided, use the entity type name and label.
           if (!isset($this->bundleInfo[$type])) {
-            $this->bundleInfo[$type][$type]['label'] = $entity_type->getLabel();
+            $this->bundleInfo[$type][$type]['label'] = $entity_type->get('label');
           }
         }
         $this->moduleHandler->alter('entity_bundle_info', $this->bundleInfo);
diff --git a/core/lib/Drupal/Core/Entity/Plugin/DataType/Deriver/EntityDeriver.php b/core/lib/Drupal/Core/Entity/Plugin/DataType/Deriver/EntityDeriver.php
index dc54e75..89a42ab 100644
--- a/core/lib/Drupal/Core/Entity/Plugin/DataType/Deriver/EntityDeriver.php
+++ b/core/lib/Drupal/Core/Entity/Plugin/DataType/Deriver/EntityDeriver.php
@@ -82,7 +82,8 @@ public function getDerivativeDefinitions($base_plugin_definition) {
     // Add definitions for each entity type and bundle.
     foreach ($this->entityManager->getDefinitions() as $entity_type_id => $entity_type) {
       $this->derivatives[$entity_type_id] = array(
-        'label' => $entity_type->getLabel(),
+        // Use get('label') to not get the already translated wrapper.
+        'label' => $entity_type->get('label'),
         'class' => $entity_type->getClass(),
         'constraints' => array('EntityType' => $entity_type_id),
       ) + $base_plugin_definition;
diff --git a/core/lib/Drupal/Core/Extension/ModuleHandler.php b/core/lib/Drupal/Core/Extension/ModuleHandler.php
index f0b06dd..3583dea 100644
--- a/core/lib/Drupal/Core/Extension/ModuleHandler.php
+++ b/core/lib/Drupal/Core/Extension/ModuleHandler.php
@@ -880,6 +880,8 @@ public function install(array $module_list, $enable_dependencies = TRUE) {
       $this->invokeAll('modules_installed', array($modules_installed));
     }
 
+    \Drupal::service('router.builder')->setRebuildNeeded();
+
     return TRUE;
   }
 
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php
index 2fb8242..d421d21 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php
@@ -7,11 +7,13 @@
 
 namespace Drupal\Core\Field\Plugin\Field\FieldType;
 
+use Drupal\Core\Annotation\Translation;
 use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\FieldItemBase;
 use Drupal\Core\Field\FieldStorageDefinitionInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\StringTranslation\TranslationWrapper;
 use Drupal\Core\TypedData\OptionsProviderInterface;
 use Drupal\Core\TypedData\DataDefinition;
 
@@ -33,8 +35,8 @@ class BooleanItem extends FieldItemBase implements OptionsProviderInterface {
    */
   public static function defaultStorageSettings() {
     return array(
-      'on_label' => t('On'),
-      'off_label' => t('Off'),
+      'on_label' => new TranslationWrapper('On'),
+      'off_label' => new TranslationWrapper('Off'),
     ) + parent::defaultStorageSettings();
   }
 
@@ -42,8 +44,10 @@ public static function defaultStorageSettings() {
    * {@inheritdoc}
    */
   public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
+    // Use TranslationWrapper as those can be called during early bootstrap,
+    // before the translation system is ready.
     $properties['value'] = DataDefinition::create('boolean')
-      ->setLabel(t('Boolean value'));
+      ->setLabel(new TranslationWrapper('Boolean value'));
 
     return $properties;
   }
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php
index 961eb67..9c81c10 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php
@@ -7,9 +7,11 @@
 
 namespace Drupal\Core\Field\Plugin\Field\FieldType;
 
+use Drupal\Core\Annotation\Translation;
 use Drupal\Core\Field\FieldStorageDefinitionInterface;
 use Drupal\Core\Field\FieldItemBase;
 use Drupal\Core\Language\LanguageInterface;
+use Drupal\Core\StringTranslation\TranslationWrapper;
 use Drupal\Core\TypedData\DataDefinition;
 use Drupal\Core\TypedData\DataReferenceDefinition;
 
@@ -34,12 +36,14 @@ class LanguageItem extends FieldItemBase {
    * {@inheritdoc}
    */
   public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
+    // Use TranslationWrapper as those can be called during early bootstrap,
+    // before the translation system is ready.
     $properties['value'] = DataDefinition::create('string')
-      ->setLabel(t('Language code'));
+      ->setLabel(new TranslationWrapper('Language code'));
 
     $properties['language'] = DataReferenceDefinition::create('language')
-      ->setLabel(t('Language object'))
-      ->setDescription(t('The referenced language'))
+      ->setLabel(new TranslationWrapper('Language object'))
+      ->setDescription(new TranslationWrapper('The referenced language'))
       // The language object is retrieved via the language code.
       ->setComputed(TRUE)
       ->setReadOnly(FALSE);
diff --git a/core/lib/Drupal/Core/Session/SessionHandler.php b/core/lib/Drupal/Core/Session/SessionHandler.php
index c8d69fb..e4dc829 100644
--- a/core/lib/Drupal/Core/Session/SessionHandler.php
+++ b/core/lib/Drupal/Core/Session/SessionHandler.php
@@ -81,7 +81,7 @@ public function read($sid) {
     $insecure_session_name = $this->sessionManager->getInsecureName();
     $cookies = $this->requestStack->getCurrentRequest()->cookies;
     if (!$cookies->has($this->getName()) && !$cookies->has($insecure_session_name)) {
-      $user = new UserSession();
+      $user = new AnonymousUserSession();
       return '';
     }
 
@@ -94,7 +94,7 @@ public function read($sid) {
     // database.
     if ($this->requestStack->getCurrentRequest()->isSecure()) {
       // Try to load a session using the HTTPS-only secure session id.
-      $values = $this->connection->query("SELECT u.*, s.* FROM {users_field_data} u INNER JOIN {sessions} s ON u.uid = s.uid WHERE u.default_langcode = 1 AND s.ssid = :ssid", array(
+      $values = $this->connection->query("SELECT s.* FROM {sessions} s WHERE s.ssid = :ssid", array(
         ':ssid' => Crypt::hashBase64($sid),
       ))->fetchAssoc();
       if (!$values) {
@@ -103,7 +103,7 @@ public function read($sid) {
         if ($cookies->has($insecure_session_name)) {
           $insecure_session_id = $cookies->get($insecure_session_name);
           $args = array(':sid' => Crypt::hashBase64($insecure_session_id));
-          $values = $this->connection->query("SELECT u.*, s.* FROM {users_field_data} u INNER JOIN {sessions} s ON u.uid = s.uid WHERE u.default_langcode = 1 AND s.sid = :sid AND s.uid = 0", $args)->fetchAssoc();
+          $values = $this->connection->query("SELECT s.* FROM {sessions} s WHERE s.sid = :sid AND s.uid = 0", $args)->fetchAssoc();
           if ($values) {
             $this->sessionSetObsolete($insecure_session_id);
           }
@@ -112,35 +112,34 @@ public function read($sid) {
     }
     else {
       // Try to load a session using the non-HTTPS session id.
-      $values = $this->connection->query("SELECT u.*, s.* FROM {users_field_data} u INNER JOIN {sessions} s ON u.uid = s.uid WHERE u.default_langcode = 1 AND s.sid = :sid", array(
+      $values = $this->connection->query("SELECT s.* FROM {sessions} s WHERE s.sid = :sid", array(
         ':sid' => Crypt::hashBase64($sid),
       ))->fetchAssoc();
     }
 
     // We found the client's session record and they are an authenticated,
     // active user.
-    if ($values && $values['uid'] > 0 && $values['status'] == 1) {
-      // Add roles element to $user.
-      $rids = $this->connection->query("SELECT ur.rid FROM {users_roles} ur WHERE ur.uid = :uid", array(
-        ':uid' => $values['uid'],
-      ))->fetchCol();
-      $values['roles'] = array_merge(array(DRUPAL_AUTHENTICATED_RID), $rids);
-      $user = new UserSession($values);
+    $user = NULL;
+    if ($values && $values['uid'] > 0) {
+      $user = \Drupal::entityManager()->getStorage('user')->load($values['uid']);
+      if ($user->isBlocked()) {
+        $user = NULL;
+      }
     }
-    elseif ($values) {
-      // The user is anonymous or blocked. Only preserve two fields from the
+
+    if (!$user && $values) {
+      // The user is anonymous or blocked. Only preserve the timestamp from the
       // {sessions} table.
       $user = new UserSession(array(
-        'session' => $values['session'],
-        'access' => $values['access'],
+        'access' => $values['timestamp'],
       ));
     }
-    else {
+    elseif (!$user) {
       // The session has expired.
-      $user = new UserSession();
+      $user = new AnonymousUserSession();
     }
 
-    return $user->session;
+    return isset($values['session']) ? $values['session'] : '';
   }
 
   /**
diff --git a/core/modules/user/src/Entity/User.php b/core/modules/user/src/Entity/User.php
index ee75930..1d494f0 100644
--- a/core/modules/user/src/Entity/User.php
+++ b/core/modules/user/src/Entity/User.php
@@ -12,6 +12,7 @@
 use Drupal\Core\Entity\EntityStorageInterface;
 use Drupal\Core\Entity\EntityTypeInterface;
 use Drupal\Core\Field\BaseFieldDefinition;
+use Drupal\Core\StringTranslation\TranslationWrapper;
 use Drupal\user\UserInterface;
 
 /**
@@ -443,34 +444,34 @@ public function getChangedTime() {
    */
   public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['uid'] = BaseFieldDefinition::create('integer')
-      ->setLabel(t('User ID'))
-      ->setDescription(t('The user ID.'))
+      ->setLabel(new TranslationWrapper('User ID'))
+      ->setDescription(new TranslationWrapper('The user ID.'))
       ->setReadOnly(TRUE)
       ->setSetting('unsigned', TRUE);
 
     $fields['uuid'] = BaseFieldDefinition::create('uuid')
-      ->setLabel(t('UUID'))
-      ->setDescription(t('The user UUID.'))
+      ->setLabel(new TranslationWrapper('UUID'))
+      ->setDescription(new TranslationWrapper('The user UUID.'))
       ->setReadOnly(TRUE);
 
     $fields['langcode'] = BaseFieldDefinition::create('language')
-      ->setLabel(t('Language code'))
-      ->setDescription(t('The user language code.'));
+      ->setLabel(new TranslationWrapper('Language code'))
+      ->setDescription(new TranslationWrapper('The user language code.'));
 
     $fields['preferred_langcode'] = BaseFieldDefinition::create('language')
-      ->setLabel(t('Preferred admin language code'))
-      ->setDescription(t("The user's preferred language code for receiving emails and viewing the site."));
+      ->setLabel(new TranslationWrapper('Preferred admin language code'))
+      ->setDescription(new TranslationWrapper("The user's preferred language code for receiving emails and viewing the site."));
 
     $fields['preferred_admin_langcode'] = BaseFieldDefinition::create('language')
-      ->setLabel(t('Preferred language code'))
-      ->setDescription(t("The user's preferred language code for viewing administration pages."))
+      ->setLabel(new TranslationWrapper('Preferred language code'))
+      ->setDescription(new TranslationWrapper("The user's preferred language code for viewing administration pages."))
       ->setDefaultValue('');
 
     // The name should not vary per language. The username is the visual
     // identifier for a user and needs to be consistent in all languages.
     $fields['name'] = BaseFieldDefinition::create('string')
-      ->setLabel(t('Name'))
-      ->setDescription(t('The name of this user.'))
+      ->setLabel(new TranslationWrapper('Name'))
+      ->setDescription(new TranslationWrapper('The name of this user.'))
       ->setDefaultValue('')
       ->setConstraints(array(
         // No Length constraint here because the UserName constraint also covers
@@ -480,62 +481,62 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ));
 
     $fields['pass'] = BaseFieldDefinition::create('string')
-      ->setLabel(t('Password'))
-      ->setDescription(t('The password of this user (hashed).'));
+      ->setLabel(new TranslationWrapper('Password'))
+      ->setDescription(new TranslationWrapper('The password of this user (hashed).'));
 
     $fields['mail'] = BaseFieldDefinition::create('email')
-      ->setLabel(t('Email'))
-      ->setDescription(t('The email of this user.'))
+      ->setLabel(new TranslationWrapper('Email'))
+      ->setDescription(new TranslationWrapper('The email of this user.'))
       ->setDefaultValue('')
       ->setConstraints(array('UserMailUnique' => array()));
 
     // @todo Convert to a text field in https://drupal.org/node/1548204.
     $fields['signature'] = BaseFieldDefinition::create('string')
-      ->setLabel(t('Signature'))
-      ->setDescription(t('The signature of this user.'))
+      ->setLabel(new TranslationWrapper('Signature'))
+      ->setDescription(new TranslationWrapper('The signature of this user.'))
       ->setTranslatable(TRUE);
     $fields['signature_format'] = BaseFieldDefinition::create('string')
-      ->setLabel(t('Signature format'))
-      ->setDescription(t('The signature format of this user.'));
+      ->setLabel(new TranslationWrapper('Signature format'))
+      ->setDescription(new TranslationWrapper('The signature format of this user.'));
 
     $fields['timezone'] = BaseFieldDefinition::create('string')
-      ->setLabel(t('Timezone'))
-      ->setDescription(t('The timezone of this user.'))
+      ->setLabel(new TranslationWrapper('Timezone'))
+      ->setDescription(new TranslationWrapper('The timezone of this user.'))
       ->setSetting('max_length', 32);
 
     $fields['status'] = BaseFieldDefinition::create('boolean')
-      ->setLabel(t('User status'))
-      ->setDescription(t('Whether the user is active or blocked.'))
+      ->setLabel(new TranslationWrapper('User status'))
+      ->setDescription(new TranslationWrapper('Whether the user is active or blocked.'))
       ->setDefaultValue(FALSE);
 
     $fields['created'] = BaseFieldDefinition::create('created')
-      ->setLabel(t('Created'))
-      ->setDescription(t('The time that the user was created.'));
+      ->setLabel(new TranslationWrapper('Created'))
+      ->setDescription(new TranslationWrapper('The time that the user was created.'));
 
     $fields['changed'] = BaseFieldDefinition::create('changed')
-      ->setLabel(t('Changed'))
-      ->setDescription(t('The time that the user was last edited.'));
+      ->setLabel(new TranslationWrapper('Changed'))
+      ->setDescription(new TranslationWrapper('The time that the user was last edited.'));
 
     $fields['access'] = BaseFieldDefinition::create('timestamp')
-      ->setLabel(t('Last access'))
-      ->setDescription(t('The time that the user last accessed the site.'))
+      ->setLabel(new TranslationWrapper('Last access'))
+      ->setDescription(new TranslationWrapper('The time that the user last accessed the site.'))
       ->setDefaultValue(0);
 
     $fields['login'] = BaseFieldDefinition::create('timestamp')
-      ->setLabel(t('Last login'))
-      ->setDescription(t('The time that the user last logged in.'))
+      ->setLabel(new TranslationWrapper('Last login'))
+      ->setDescription(new TranslationWrapper('The time that the user last logged in.'))
       ->setDefaultValue(0);
 
     $fields['init'] = BaseFieldDefinition::create('email')
-      ->setLabel(t('Initial email'))
-      ->setDescription(t('The email address used for initial account creation.'))
+      ->setLabel(new TranslationWrapper('Initial email'))
+      ->setDescription(new TranslationWrapper('The email address used for initial account creation.'))
       ->setDefaultValue('');
 
     $fields['roles'] = BaseFieldDefinition::create('entity_reference')
       ->setCustomStorage(TRUE)
-      ->setLabel(t('Roles'))
+      ->setLabel(new TranslationWrapper('Roles'))
       ->setCardinality(BaseFieldDefinition::CARDINALITY_UNLIMITED)
-      ->setDescription(t('The roles the user has.'))
+      ->setDescription(new TranslationWrapper('The roles the user has.'))
       ->setSetting('target_type', 'user_role');
 
     return $fields;
diff --git a/core/modules/views/src/Plugin/views/display/Page.php b/core/modules/views/src/Plugin/views/display/Page.php
index 08da0a2..cd54540 100644
--- a/core/modules/views/src/Plugin/views/display/Page.php
+++ b/core/modules/views/src/Plugin/views/display/Page.php
@@ -46,9 +46,8 @@ protected function defineOptions() {
     $options['menu'] = array(
       'contains' => array(
         'type' => array('default' => 'none'),
-        // Do not translate menu and title as menu system will.
-        'title' => array('default' => '', 'translatable' => FALSE),
-        'description' => array('default' => '', 'translatable' => FALSE),
+        'title' => array('default' => ''),
+        'description' => array('default' => ''),
         'weight' => array('default' => 0),
         'menu_name' => array('default' => 'navigation'),
         'parent' => array('default' => ''),
@@ -58,11 +57,9 @@ protected function defineOptions() {
     $options['tab_options'] = array(
       'contains' => array(
         'type' => array('default' => 'none'),
-        // Do not translate menu and title as menu system will.
-        'title' => array('default' => '', 'translatable' => FALSE),
-        'description' => array('default' => '', 'translatable' => FALSE),
+        'title' => array('default' => ''),
+        'description' => array('default' => ''),
         'weight' => array('default' => 0),
-        'menu_name' => array('default' => 'navigation'),
       ),
     );
 
@@ -336,30 +333,7 @@ public function buildOptionsForm(&$form, FormStateInterface $form_state) {
             ),
           ),
         );
-        // Only display the menu selector if Menu UI module is enabled.
-        if (\Drupal::moduleHandler()->moduleExists('menu_ui')) {
-          $form['tab_options']['name'] = array(
-            '#title' => $this->t('Menu'),
-            '#type' => 'select',
-            '#options' => menu_ui_get_menus(),
-            '#default_value' => $tab_options['name'],
-            '#description' => $this->t('Insert item into an available menu.'),
-            '#states' => array(
-              'visible' => array(
-                ':input[name="tab_options[type]"]' => array('value' => 'normal'),
-              ),
-            ),
-          );
-        }
-        else {
-          $form['tab_options']['menu_name'] = array(
-            '#type' => 'value',
-            '#value' => $tab_options['menu_name'],
-          );
-          $form['tab_options']['markup'] = array(
-            '#markup' => $this->t('Menu selection requires the activation of Menu UI module.'),
-          );
-        }
+
         $form['tab_options']['weight'] = array(
           '#suffix' => '</div>',
           '#title' => $this->t('Tab weight'),