diff --git a/core/includes/common.inc b/core/includes/common.inc
index 188934b..ec88c45 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -3136,7 +3136,12 @@ function drupal_render(&$elements, $is_recursive_call = FALSE) {
     '#suffix',
   );
   foreach ($markup_keys as $key) {
-    $elements[$key] = isset($elements[$key]) ? Xss::filterAdmin($elements[$key]) : NULL;
+    if (!empty($elements[$key]) && !is_array($elements[$key])) {
+      $elements[$key] = Xss::filterAdmin($elements[$key]);
+    }
+    else {
+      $elements[$key] = NULL;
+    }
   }
 
   // Assume that if #theme is set it represents an implemented hook.
diff --git a/core/modules/locale/src/Form/ImportForm.php b/core/modules/locale/src/Form/ImportForm.php
index 426187f..75dda76 100644
--- a/core/modules/locale/src/Form/ImportForm.php
+++ b/core/modules/locale/src/Form/ImportForm.php
@@ -103,18 +103,22 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       'file_validate_extensions' => array('po'),
       'file_validate_size' => array(file_upload_max_size()),
     );
+
+    $file_description = array(
+      '#theme' => 'file_upload_help',
+      '#description' => $this->t('A Gettext Portable Object file.'),
+      '#upload_validators' => $validators,
+    );
+
     $form['file'] = array(
       '#type' => 'file',
       '#title' => $this->t('Translation file'),
-      '#description' => array(
-        '#theme' => 'file_upload_help',
-        '#description' => $this->t('A Gettext Portable Object file.'),
-        '#upload_validators' => $validators,
-      ),
+      '#description' => drupal_render($file_description),
       '#size' => 50,
       '#upload_validators' => $validators,
       '#attributes' => array('class' => array('file-import-input')),
     );
+
     $form['langcode'] = array(
       '#type' => 'select',
       '#title' => $this->t('Language'),