protected function getTrans($filename)
    {
        if (is_file($filename)) {
            $trans = Yaml::parse(file_get_contents($filename));
        } else {
            $trans = array();
        }

        $keys = array('breadcrumb', 'list', 'filter', 'show', 'form');
        foreach ($keys as $key) {
            if (!array_key_exists($key, $trans)) {
                $trans[$key] = array();
            }
        }

        return $trans;
    }