diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index 324c97c..2d06d6f 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -450,7 +450,7 @@ function install_begin_request($class_loader, &$install_state) {
   }
 
   // Use the language from profile configuration if available.
-  if (isset($install_state['profile_info']['config_install']) && $install_state['profile_info']['config_install']) {
+  if (!empty($install_state['profile_info']['config_install'])) {
     $install_state['parameters']['langcode'] = $install_state['profile_info']['config']['system.site']['default_langcode'];
   }
   else {
@@ -1272,7 +1272,7 @@ function _install_select_profile(&$install_state) {
     // Get all visible (not hidden) profiles.
     $visible_profiles = array_filter($install_state['profiles'], function ($profile) {
       $profile_info = install_profile_info($profile->getName());
-      return !isset($profile_info['hidden']) || !$profile_info['hidden'];
+      return empty($profile_info['hidden']);
     });
   }
   else {
@@ -2307,7 +2307,7 @@ function install_config_import_batch() {
   }
   catch (ConfigImporterException $e) {
     // There are validation errors.
-    drupal_set_message(\Drupal::translation()->translate('The configuration synchronization failed validation.'));
+    drupal_set_message(t('The configuration synchronization failed validation.'));
     foreach ($config_importer->getErrors() as $message) {
       drupal_set_message($message, 'error');
     }
@@ -2353,7 +2353,7 @@ function install_config_import_batch_finish($success, $results, $operations) {
         drupal_set_message($error, 'error');
         \Drupal::logger('config_sync')->error($error);
       }
-      drupal_set_message(\Drupal::translation()->translate('The configuration was imported with errors.'), 'warning');
+      drupal_set_message(t('The configuration was imported with errors.'), 'warning');
     }
     else {
       // Configuration sync needs a complete cache flush.
@@ -2364,11 +2364,10 @@ function install_config_import_batch_finish($success, $results, $operations) {
     // An error occurred.
     // $operations contains the operations that remained unprocessed.
     $error_operation = reset($operations);
-    $message = \Drupal::translation()
-      ->translate('An error occurred while processing %error_operation with arguments: @arguments', [
-        '%error_operation' => $error_operation[0],
-        '@arguments' => print_r($error_operation[1], TRUE)
-      ]);
+    $message = t('An error occurred while processing %error_operation with arguments: @arguments', [
+      '%error_operation' => $error_operation[0],
+      '@arguments' => print_r($error_operation[1], TRUE)
+    ]);
     drupal_set_message($message, 'error');
   }
 }
@@ -2421,7 +2420,7 @@ function install_config_fix_profile() {
     }
     catch (ConfigImporterException $e) {
       // There are validation errors.
-      drupal_set_message(\Drupal::translation()->translate('The configuration synchronization failed validation.'));
+      drupal_set_message(t('The configuration synchronization failed validation.'));
       foreach ($config_importer->getErrors() as $message) {
         drupal_set_message($message, 'error');
       }