l::get PHP Method

    static function get($key = null, $default = null)
    {
        if (empty($key)) {
            return self::$lang;
        }
        return a::get(self::$lang, $key, $default);
    }

 public function __construct()
 {
     $this->type = 'text';
     $this->icon = 'user';
     $this->label = l::get('fields.user.label', 'User');
     $this->placeholder = l::get('fields.user.placeholder', 'Username…');
 }