only in patch2:
unchanged:
--- a/core/modules/migrate/src/Plugin/migrate/destination/EntityConfigBase.php
+++ b/core/modules/migrate/src/Plugin/migrate/destination/EntityConfigBase.php
@@ -4,9 +4,14 @@
 
 use Drupal\Component\Utility\NestedArray;
 use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\language\ConfigurableLanguageManagerInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
 use Drupal\migrate\MigrateException;
 use Drupal\migrate\Plugin\MigrateIdMapInterface;
 use Drupal\migrate\Row;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Class for importing configuration entities.
@@ -21,6 +26,52 @@
 class EntityConfigBase extends Entity {
 
   /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * Construct a new entity.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param MigrationInterface $migration
+   *   The migration.
+   * @param EntityStorageInterface $storage
+   *   The storage for this entity type.
+   * @param array $bundles
+   *   The list of bundles this entity type has.
+   * @param LanguageManagerInterface $language_manager
+   *   The language manager.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, EntityStorageInterface $storage, array $bundles, LanguageManagerInterface $language_manager) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $migration, $storage, $bundles);
+    $this->languageManager = $language_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
+    $entity_type_id = static::getEntityTypeId($plugin_id);
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $migration,
+      $container->get('entity.manager')->getStorage($entity_type_id),
+      array_keys($container->get('entity.manager')->getBundleInfo($entity_type_id)),
+      $container->get('language_manager')
+    );
+  }
+
+  /**
    * {@inheritdoc}
    */
   public function import(Row $row, array $old_destination_id_values = array()) {
@@ -70,10 +121,27 @@ public function getIds() {
    *   The row object to update from.
    */
   protected function updateEntity(EntityInterface $entity, Row $row) {
-    foreach ($row->getRawDestination() as $property => $value) {
-      $this->updateEntityProperty($entity, explode(Row::PROPERTY_SEPARATOR, $property), $value);
+    // This is a translation if the language in the active config matches the
+    // language of this row.
+    $translation = FALSE;
+    if ($row->hasDestinationProperty('langcode') && $this->languageManager instanceof ConfigurableLanguageManagerInterface)  {
+      $config = $entity->getConfigDependencyName();
+      $langcode = \Drupal::config($config)->get('langcode');
+      if ($langcode != $row->getDestinationProperty('langcode')) {
+        $translation = TRUE;
+      }
     }
 
+    if ($translation) {
+      $config_override = $this->languageManager->getLanguageConfigOverride($row->getDestinationProperty('langcode'), $config);
+      $config_override->set(str_replace(Row::PROPERTY_SEPARATOR, '.', $row->getDestinationProperty('property')), $row->getDestinationProperty('translation'));
+      $config_override->save();
+    }
+    else {
+      foreach ($row->getRawDestination() as $property => $value) {
+        $this->updateEntityProperty($entity, explode(Row::PROPERTY_SEPARATOR, $property), $value);
+      }
+    }
     $this->setRollbackAction($row->getIdMap());
   }
 
only in patch2:
unchanged:
--- a/core/modules/migrate_drupal/src/Plugin/migrate/destination/EntityFieldStorageConfig.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/destination/EntityFieldStorageConfig.php
@@ -4,6 +4,7 @@
 
 use Drupal\Core\Entity\EntityStorageInterface;
 use Drupal\Core\Field\FieldTypePluginManagerInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Drupal\migrate\Plugin\MigrationInterface;
 use Drupal\migrate\Plugin\migrate\destination\EntityFieldStorageConfig as BaseEntityFieldStorageConfig;
@@ -39,11 +40,14 @@ class EntityFieldStorageConfig extends BaseEntityFieldStorageConfig {
    *   The storage for this entity type.
    * @param array $bundles
    *   The list of bundles this entity type has.
+   * @param LanguageManagerInterface $language_manager
+   *   The language manager.
    * @param \Drupal\Core\Field\FieldTypePluginManagerInterface $field_type_plugin_manager
    *   The field type plugin manager.
    */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, EntityStorageInterface $storage, array $bundles, FieldTypePluginManagerInterface $field_type_plugin_manager) {
-    parent::__construct($configuration, $plugin_id, $plugin_definition, $migration, $storage, $bundles);
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, EntityStorageInterface $storage, array $bundles, LanguageManagerInterface $language_manager, FieldTypePluginManagerInterface $field_type_plugin_manager) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $migration, $storage, $bundles, $language_manager, $field_type_plugin_manager);
+    $this->languageManager = $language_manager;
     $this->fieldTypePluginManager = $field_type_plugin_manager;
   }
 
@@ -59,6 +63,7 @@ public static function create(ContainerInterface $container, array $configuratio
       $migration,
       $container->get('entity.manager')->getStorage($entity_type_id),
       array_keys($container->get('entity.manager')->getBundleInfo($entity_type_id)),
+      $container->get('language_manager'),
       $container->get('plugin.manager.field.field_type')
     );
   }