Add command class

app/Console/Kernel.php

@@ -14,6 +14,7 @@ class Kernel extends ConsoleKernel
      */
     protected $commands = [
         Commands\CreateDatabase::class,
+        Commands\Install::class,
     ];
 
     /**

bootstrap/application.php

@@ -54,7 +54,7 @@ class Application extends LaravelApplication
 
     public function langPath()
     {
-        return $this->resourcePath() . DIRECTORY_SEPARATOR . 'lang';
+        return $this->resourcePath() . DS . 'lang';
     }
 
     public function publicPath()