diff --git a/ext.php b/ext.php
index 47edd35..4d0a4d7 100644
--- a/ext.php
+++ b/ext.php
@@ -42,7 +42,10 @@ public function is_enableable()
 
 		if ($ext_manager->is_enabled(self::OLD_EXT_NAME))
 		{
-			return ['Disable the old "' . self::OLD_EXT_NAME . '" extension first.'];
+			$language = $this->container->get('language');
+			$language->add_lang('install_menu', 'phpbbmodders/menu');
+
+			return $language->lang('MENU_DISABLE_OLD', self::OLD_EXT_NAME);
 		}
 
 		return true;
diff --git a/language/en/install_menu.php b/language/en/install_menu.php
index 075bc43..286c8c0 100644
--- a/language/en/install_menu.php
+++ b/language/en/install_menu.php
@@ -39,4 +39,5 @@
 
 $lang = array_merge($lang, [
 	'MENU_NOT_ENABLEABLE'	=> 'phpBB Modders Menu could not be enabled. The minimum requirements of phpBB 3.3.19 and/or PHP 7.4.0 were not satisfied.',
+	'MENU_DISABLE_OLD'	=> 'Disable the old “%s” extension first.',
 ]);