diff -u b/core/modules/locale/lib/Drupal/locale/Form/ImportForm.php b/core/modules/locale/lib/Drupal/locale/Form/ImportForm.php
--- b/core/modules/locale/lib/Drupal/locale/Form/ImportForm.php
+++ b/core/modules/locale/lib/Drupal/locale/Form/ImportForm.php
@@ -7,11 +7,11 @@
 
 namespace Drupal\locale\Form;
 
-use Drupal\file\FileInterface;
 use Drupal\Core\Form\FormBase;
 use Drupal\Core\Language\Language;
 use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Language\LanguageManager;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
@@ -27,11 +27,19 @@
   protected $moduleHandler;
 
   /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManager
+   */
+  protected $languageManager;
+
+  /**
    * {@inheritdoc}
    */
   public static function create(ContainerInterface $container) {
     return new static(
-      $container->get('module_handler')
+      $container->get('module_handler'),
+      $container->get('language_manager')
     );
   }
   /**
@@ -39,15 +47,16 @@
    *
    * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
    */
-  public function __construct(ModuleHandlerInterface $module_handler) {
+  public function __construct(ModuleHandlerInterface $module_handler, LanguageManager $language_manager) {
     $this->moduleHandler = $module_handler;
+    $this->languageManager = $language_manager;
   }
 
   /**
    * {@inheritdoc}
    */
   public function getFormID() {
-    return 'locale_translate_import';
+    return 'locale_translate_import_form';
   }
 
   /**
@@ -56,8 +65,8 @@
    * @ingroup forms
    */
   public function buildForm(array $form, array &$form_state) {
-    \Drupal::languageManager()->reset();
-    $languages = language_list();
+    $this->languageManager->reset();
+    $languages = $this->languageManager->getLanguages();
 
     // Initialize a language list to the ones available, including English if we
     // are to translate Drupal to English as well.
@@ -92,7 +101,7 @@
       '#type' => 'file',
       '#title' => $this->t('Translation file'),
       '#description' => array(
-        '#type' => 'file_upload_help',
+        '#theme' => 'file_upload_help',
         '#description' => $this->t('A Gettext Portable Object file.'),
         '#upload_validators' => $validators,
        ),
@@ -180,5 +189,3 @@
     $form_state['redirect_route']['route_name'] = 'locale.translate_page';
-    return;
   }
-
 }