ZF-9488: only use the region part (instead of locale) if only the region is needed (Iban, PostCode)
The validators Zend_Validate_Iban & Zend_Validate_PostCode need (or can use) a region code to validate a value. But they don't need the a complete local!
Additionally The language part is not in evidence if your application only knows a region. -> For example the region of china is CN but cn_CN isn't a valid locale. You have to use zh_CN.
I see Zend_Validate_PostCode uses the locale:
$format = Zend_Locale::getTranslation( $locale->getRegion(), 'postaltoterritory', $this->_locale );
I don't tested it if there is a way to get the format of the post code but i don't know why a post code could be specific by a language as by the region.