diff -u b/core/modules/migrate/src/Plugin/migrate/destination/EntityConfigBase.php b/core/modules/migrate/src/Plugin/migrate/destination/EntityConfigBase.php
--- b/core/modules/migrate/src/Plugin/migrate/destination/EntityConfigBase.php
+++ b/core/modules/migrate/src/Plugin/migrate/destination/EntityConfigBase.php
@@ -121,13 +121,18 @@
    *   The row object to update from.
    */
   protected function updateEntity(EntityInterface $entity, Row $row) {
-    // If this row has a language code and it is not the active language
-    // and the language manager is configurable then this is a row with a
-    // translation string.
-    if ($row->hasDestinationProperty('langcode') &&
-      ($row->getDestinationProperty('langcode') != $this->languageManager->getCurrentLanguage()->getId()) &&
-      ($this->languageManager instanceof ConfigurableLanguageManagerInterface)) {
+    // This is a translation if the language in the active config matches the
+    // language of this row.
+    $translation = FALSE;
+    if ($row->hasDestinationProperty('langcode')) {
       $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();