public function getOne($countryCode, $locale = 'en', $source = 'cldr')
{
$countryCode = mb_strtoupper($countryCode);
$locales = $this->loadData($locale, mb_strtolower($source), 'php');
if (!$this->has($countryCode, $locale, $source)) {
throw new CountryNotFoundException($countryCode);
}
return $locales[mb_strtoupper($countryCode)];
}