add not found text

src/server.php

@@ -698,11 +698,15 @@ $server->setHandler(
                 }
         }
 
-        // Route not found
+        // Not found
         $response->setCode(
             51
         );
 
+        $response->setMeta(
+            $config->string->nothing
+        );
+
         return $response;
     }
 );