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 && $element instanceof PrimitiveInterface) {
         // Special handling for integers and floats since the configuration
diff --git a/core/lib/Drupal/Core/Entity/EntityManager.php b/core/lib/Drupal/Core/Entity/EntityManager.php
index 128d21d..e1e236b 100644
--- a/core/lib/Drupal/Core/Entity/EntityManager.php
+++ b/core/lib/Drupal/Core/Entity/EntityManager.php
@@ -711,7 +711,7 @@ public function getAllBundleInfo() {
         foreach ($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', $this->bundleInfo);
diff --git a/core/lib/Drupal/Core/Entity/Plugin/DataType/Deriver/EntityDeriver.php b/core/lib/Drupal/Core/Entity/Plugin/DataType/Deriver/EntityDeriver.php
index 0c80fcf..254a7ca 100644
--- a/core/lib/Drupal/Core/Entity/Plugin/DataType/Deriver/EntityDeriver.php
+++ b/core/lib/Drupal/Core/Entity/Plugin/DataType/Deriver/EntityDeriver.php
@@ -82,7 +82,8 @@ public function getDerivativeDefinitions($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'),
         'constraints' => array('EntityType' => $entity_type_id),
       ) + $base_plugin_definition;
 
diff --git a/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php b/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php
index dac6584..97f9dd2 100644
--- a/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php
+++ b/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php
@@ -1403,7 +1403,7 @@ protected function getSharedTableFieldSchema(FieldStorageDefinitionInterface $st
       $column_schema = $field_schema['columns'][$field_column_name];
 
       $schema['fields'][$schema_field_name] = $column_schema;
-      $schema['fields'][$schema_field_name]['description'] = $field_description;
+      $schema['fields'][$schema_field_name]['description'] = (string) $field_description;
       // Only entity keys are required.
       $keys = $this->entityType->getKeys() + array('langcode' => 'langcode');
       // The label is an entity key, but label fields are not necessarily
diff --git a/core/lib/Drupal/Core/Extension/ModuleInstaller.php b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
index 20a6506..c65f3d4 100644
--- a/core/lib/Drupal/Core/Extension/ModuleInstaller.php
+++ b/core/lib/Drupal/Core/Extension/ModuleInstaller.php
@@ -370,6 +370,9 @@ public function uninstall(array $module_list, $uninstall_dependents = TRUE) {
       // Remove any potential cache bins provided by the module.
       $this->removeCacheBins($module);
 
+      // Update the kernel to exclude the uninstalled modules.
+      $this->updateKernel($module_filenames);
+
       // Clear the static cache of system_rebuild_module_data() to pick up the
       // new module, since it merges the installation status of modules into
       // its statically cached list.
@@ -379,9 +382,6 @@ public function uninstall(array $module_list, $uninstall_dependents = TRUE) {
       \Drupal::getContainer()->get('plugin.cache_clearer')->clearCachedDefinitions();
       \Drupal::service('router.builder_indicator')->setRebuildNeeded();
 
-      // Update the kernel to exclude the uninstalled modules.
-      $this->updateKernel($module_filenames);
-
       // Update the theme registry to remove the newly uninstalled module.
       drupal_theme_rebuild();
 
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'));
 
     $properties['language'] = DataReferenceDefinition::create('language')
-      ->setLabel(t('Language object'))
-      ->setDescription(t('The referenced language'))
+      ->setLabel(new TranslationWrapper('Language object'))
+      ->setDescription(new TranslationWrapper('The referenced language'))
       // The language object is retrieved via the language code.
       ->setComputed(TRUE)
       ->setReadOnly(FALSE);
diff --git a/core/lib/Drupal/Core/Session/AccountInterface.php b/core/lib/Drupal/Core/Session/AccountInterface.php
index ede2854..b4187e6 100644
--- a/core/lib/Drupal/Core/Session/AccountInterface.php
+++ b/core/lib/Drupal/Core/Session/AccountInterface.php
@@ -48,30 +48,6 @@ public function getRoles($exclude_locked_roles = FALSE);
   public function hasPermission($permission);
 
   /**
-   * Returns the session ID.
-   *
-   * @return string|null
-   *   The session ID or NULL if this user does not have an active session.
-   */
-  public function getSessionId();
-
-  /**
-   * Returns the secure session ID.
-   *
-   * @return string|null
-   *   The session ID or NULL if this user does not have an active secure session.
-   */
-  public function getSecureSessionId();
-
-  /**
-   * Returns the session data.
-   *
-   * @return array
-   *   Array with the session data that belongs to this object.
-   */
-  public function getSessionData();
-
-  /**
    * Returns TRUE if the account is authenticated.
    *
    * @return bool
@@ -153,21 +129,4 @@ public function getEmail();
    */
   public function getTimeZone();
 
-  /**
-   * The timestamp when the account last accessed the site.
-   *
-   * A value of 0 means the user has never accessed the site.
-   *
-   * @return int
-   *   Timestamp of the last access.
-   */
-  public function getLastAccessedTime();
-
-  /**
-   * Returns the session hostname.
-   *
-   * @return string
-   */
-  public function getHostname();
-
 }
diff --git a/core/lib/Drupal/Core/Session/AccountProxy.php b/core/lib/Drupal/Core/Session/AccountProxy.php
index f9d0d35..3495c56 100644
--- a/core/lib/Drupal/Core/Session/AccountProxy.php
+++ b/core/lib/Drupal/Core/Session/AccountProxy.php
@@ -98,13 +98,6 @@ public function getRoles($exclude_locked_roles = FALSE) {
   /**
    * {@inheritdoc}
    */
-  public function getHostname() {
-    return $this->getAccount()->getHostname();
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function hasPermission($permission) {
     return $this->getAccount()->hasPermission($permission);
   }
@@ -112,27 +105,6 @@ public function hasPermission($permission) {
   /**
    * {@inheritdoc}
    */
-  public function getSessionId() {
-    return $this->getAccount()->getSessionId();
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getSecureSessionId() {
-    return $this->getAccount()->getSecureSessionId();
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getSessionData() {
-    return $this->getAccount()->getSessionData();
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function isAuthenticated() {
     return $this->getAccount()->isAuthenticated();
   }
@@ -179,12 +151,5 @@ public function getTimeZone() {
     return $this->getAccount()->getTimeZone();
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function getLastAccessedTime() {
-    return $this->getAccount()->getLastAccessedTime();
-  }
-
 }
 
diff --git a/core/lib/Drupal/Core/Session/SessionHandler.php b/core/lib/Drupal/Core/Session/SessionHandler.php
index 62b4074..3496ac7 100644
--- a/core/lib/Drupal/Core/Session/SessionHandler.php
+++ b/core/lib/Drupal/Core/Session/SessionHandler.php
@@ -11,6 +11,7 @@
 use Drupal\Core\Database\Connection;
 use Drupal\Core\Site\Settings;
 use Drupal\Core\Utility\Error;
+use Drupal\user\UserInterface;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Session\Storage\Proxy\AbstractProxy;
 
@@ -80,38 +81,30 @@ public function read($sid) {
     // cookies (eg. web crawlers).
     $cookies = $this->requestStack->getCurrentRequest()->cookies;
     if (empty($sid) || !$cookies->has($this->getName())) {
-      $user = new UserSession();
+      $user = new AnonymousUserSession();
       return '';
     }
 
-    $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
-      // {sessions} table.
-      $user = new UserSession(array(
-        'session' => $values['session'],
-        'access' => $values['access'],
-      ));
-    }
-    else {
-      // The session has expired.
-      $user = new UserSession();
+
+    if (!$user) {
+      // The user is anonymous, blocked or the session has expired.
+      $user = new AnonymousUserSession();
     }
 
-    return $user->session;
+    return isset($values['session']) ? $values['session'] : '';
   }
 
   /**
@@ -141,7 +134,7 @@ public function write($sid, $value) {
         ->execute();
 
       // Likewise, do not update access time more than once per 180 seconds.
-      if ($user->isAuthenticated() && REQUEST_TIME - $user->getLastAccessedTime() > Settings::get('session_write_interval', 180)) {
+      if ($user instanceof UserInterface && REQUEST_TIME - $user->getLastAccessedTime() > Settings::get('session_write_interval', 180)) {
         /** @var \Drupal\user\UserStorageInterface $storage */
         $storage = \Drupal::entityManager()->getStorage('user');
         $storage->updateLastAccessTimestamp($user, REQUEST_TIME);
diff --git a/core/lib/Drupal/Core/Session/UserSession.php b/core/lib/Drupal/Core/Session/UserSession.php
index feb935c..c3f4e24 100644
--- a/core/lib/Drupal/Core/Session/UserSession.php
+++ b/core/lib/Drupal/Core/Session/UserSession.php
@@ -31,34 +31,6 @@ class UserSession implements AccountInterface {
   protected $roles = array('anonymous');
 
   /**
-   * Session ID.
-   *
-   * @var string.
-   */
-  public $sid;
-
-  /**
-   * Secure session ID.
-   *
-   * @var string.
-   */
-  public $ssid;
-
-  /**
-   * Session data.
-   *
-   * @var array.
-   */
-  public $session;
-
-  /**
-   * The Unix timestamp when this session last requested a page.
-   *
-   * @var string.
-   */
-  protected $timestamp;
-
-  /**
    * The name of this account.
    *
    * @var string
@@ -94,13 +66,6 @@ class UserSession implements AccountInterface {
   protected $timezone;
 
   /**
-   * The hostname for this user session.
-   *
-   * @var string
-   */
-  protected $hostname = '';
-
-  /**
    * Constructs a new user session.
    *
    * @param array $values
@@ -147,27 +112,6 @@ public function hasPermission($permission) {
   /**
    * {@inheritdoc}
    */
-  public function getSecureSessionId() {
-    return $this->ssid;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getSessionData() {
-    return $this->session;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getSessionId() {
-    return $this->sid;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function isAuthenticated() {
     return $this->uid > 0;
   }
@@ -229,20 +173,6 @@ public function getTimeZone() {
   }
 
   /**
-   * {@inheritdoc}
-   */
-  public function getLastAccessedTime() {
-    return $this->timestamp;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getHostname() {
-    return $this->hostname;
-  }
-
-  /**
    * Returns the role storage object.
    *
    * @return \Drupal\user\RoleStorageInterface
diff --git a/core/modules/user/src/Entity/User.php b/core/modules/user/src/Entity/User.php
index c003db2..c364d46 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;
 
 /**
@@ -184,37 +185,6 @@ public function getRoles($exclude_locked_roles = FALSE) {
   /**
    * {@inheritdoc}
    */
-  public function getSecureSessionId() {
-    return NULL;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getSessionData() {
-    return array();
-  }
-  /**
-   * {@inheritdoc}
-   */
-  public function getSessionId() {
-    return NULL;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getHostname() {
-    if (!isset($this->hostname) && \Drupal::hasRequest()) {
-      $this->hostname = \Drupal::request()->getClientIp();
-    }
-
-    return $this->hostname;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function hasRole($rid) {
     return in_array($rid, $this->getRoles());
   }
@@ -442,34 +412,34 @@ 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 language code'))
-      ->setDescription(t("The user's preferred language code for receiving emails and viewing the site."));
+      ->setLabel(new TranslationWrapper('Preferred 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 admin language code'))
-      ->setDescription(t("The user's preferred language code for viewing administration pages."))
+      ->setLabel(new TranslationWrapper('Preferred admin 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
@@ -479,62 +449,62 @@ 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/user/src/UserInterface.php b/core/modules/user/src/UserInterface.php
index e2c44d0..fc8105a 100644
--- a/core/modules/user/src/UserInterface.php
+++ b/core/modules/user/src/UserInterface.php
@@ -182,4 +182,14 @@ public function block();
    */
   public function getInitialEmail();
 
+  /**
+   * The timestamp when the account last accessed the site.
+   *
+   * A value of 0 means the user has never accessed the site.
+   *
+   * @return int
+   *   Timestamp of the last access.
+   */
+  public function getLastAccessedTime();
+
 }
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
index 933b7ed..1da916b 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
@@ -804,11 +804,13 @@ public function testClearCachedBundles() {
   public function testGetBundleInfo($entity_type_id, $expected) {
     $apple = $this->getMock('Drupal\Core\Entity\EntityTypeInterface');
     $apple->expects($this->once())
-      ->method('getLabel')
+      ->method('get')
+      ->with('label')
       ->will($this->returnValue('Apple'));
     $banana = $this->getMock('Drupal\Core\Entity\EntityTypeInterface');
     $banana->expects($this->once())
-      ->method('getLabel')
+      ->method('get')
+      ->with('label')
       ->will($this->returnValue('Banana'));
     $this->setUpEntityManager(array(
       'apple' => $apple,
@@ -849,11 +851,13 @@ public function providerTestGetBundleInfo() {
   public function testGetAllBundleInfo() {
     $apple = $this->getMock('Drupal\Core\Entity\EntityTypeInterface');
     $apple->expects($this->once())
-      ->method('getLabel')
+      ->method('get')
+      ->with('label')
       ->will($this->returnValue('Apple'));
     $banana = $this->getMock('Drupal\Core\Entity\EntityTypeInterface');
     $banana->expects($this->once())
-      ->method('getLabel')
+      ->method('get')
+      ->with('label')
       ->will($this->returnValue('Banana'));
     $this->setUpEntityManager(array(
       'apple' => $apple,
diff --git a/core/tests/Drupal/Tests/Core/Session/AnonymousUserSessionTest.php b/core/tests/Drupal/Tests/Core/Session/AnonymousUserSessionTest.php
index 59f6f1c..7c2a1cc 100644
--- a/core/tests/Drupal/Tests/Core/Session/AnonymousUserSessionTest.php
+++ b/core/tests/Drupal/Tests/Core/Session/AnonymousUserSessionTest.php
@@ -9,10 +9,6 @@
 
 use Drupal\Tests\UnitTestCase;
 use Drupal\Core\Session\AnonymousUserSession;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\DependencyInjection\Definition;
-use Symfony\Component\DependencyInjection\Scope;
-use Symfony\Component\HttpFoundation\RequestStack;
 
 /**
  * @coversDefaultClass \Drupal\Core\Session\AnonymousUserSession
@@ -21,42 +17,6 @@
 class AnonymousUserSessionTest extends UnitTestCase {
 
   /**
-   * Tests creating an AnonymousUserSession when the request is available.
-   *
-   * @covers ::__construct
-   */
-  public function testAnonymousUserSessionWithRequest() {
-    $request = $this->getMock('Symfony\Component\HttpFoundation\Request');
-    $request->expects($this->once())
-      ->method('getClientIp')
-      ->will($this->returnValue('test'));
-    $container = new ContainerBuilder();
-    $requestStack = new RequestStack();
-    $requestStack->push($request);
-    $container->set('request_stack', $requestStack);
-    \Drupal::setContainer($container);
-
-    $anonymous_user = new AnonymousUserSession();
-
-    $this->assertSame('test', $anonymous_user->getHostname());
-  }
-
-  /**
-   * Tests creating an AnonymousUserSession when the request is not available.
-   *
-   * @covers ::__construct
-   */
-  public function testAnonymousUserSessionWithNoRequest() {
-    $container = new ContainerBuilder();
-
-    \Drupal::setContainer($container);
-
-    $anonymous_user = new AnonymousUserSession();
-
-    $this->assertSame('', $anonymous_user->getHostname());
-  }
-
-  /**
    * Tests the method getRoles exclude or include locked roles based in param.
    *
    * @covers ::getRoles