Check ja_JP environment

Check global value $_SERVER['HTTP_ACCEPT_LANGUAGE'] and fix for their browser language.

function ntl_fishing_load_textdomain() {
    $locale = get_locale();
//  var_dump($locale, $_SERVER['HTTP_ACCEPT_LANGUAGE']);
    if(strpos($_SERVER['HTTP_ACCEPT_LANGUAGE'],$local) !== false) {
        $file = dirname(plugin_basename(__FILE__)) . '/languages';
        $rt = load_plugin_textdomain('ntl-fishing', false, $file);
    }
}