protected function initCatalogsForSingleLocale($locale, $domain) {
		if (is_string($domain)) {
			$this->initCatalog($locale, $domain);
			return;
		}
			
		if (is_array($domain)) {
			$this->initCatalogForManyDomains($locale, $domain);
			return;
		}
		
		throw new InvalidParameter('Domain must be a string or an array');
	}