diff -u b/core/lib/Drupal/Core/Installer/Exception/AlreadyInstalledException.php b/core/lib/Drupal/Core/Installer/Exception/AlreadyInstalledException.php
--- b/core/lib/Drupal/Core/Installer/Exception/AlreadyInstalledException.php
+++ b/core/lib/Drupal/Core/Installer/Exception/AlreadyInstalledException.php
@@ -23,19 +23,16 @@
    *   A specific message exception message.
    */
   public function __construct(TranslationInterface $string_translation, $specific_message = '') {
-    $title = $this->t('Drupal already installed.');
+    $title = 'Drupal already installed.';
 
     $message = "<ul>\n";
     if ($specific_message !== '') {
       $message .= '<li>' . $specific_message . '</li>';
     }
-    $message .= $this->t('<li>To start over, you must empty your existing database and copy <em>default.settings.php</em> over <em>settings.php</em>.</li>
-<li>To upgrade an existing installation, proceed to the <a href="!update-url">update script</a>.</li>
-<li>View your <a href="!base-url">existing site</a>.</li>
-</ul>', array(
-      '!base-url' => $GLOBALS['base_url'],
-      '!update-url' => $GLOBALS['base_path'] . 'update.php',
-    ));
+    $message .= '<li>To start over, you must empty your existing database and copy <em>default.settings.php</em> over <em>settings.php</em>.</li>
+<li>To upgrade an existing installation, proceed to the <a href="' . $GLOBALS['base_path'] . 'update.php">update script</a>.</li>
+<li>View your <a href="' . $GLOBALS['base_url'] . '">existing site</a>.</li>
+</ul>';
 
     parent::__construct($message, $title);
   }