i18n: list of countries/provinces is not sorted correctly in UTF-8 languages

When the CiviCRM interface is in French (or, I suppose, any other language using a non-ascii latin alphabet), the list of countries in, for example, "billing information" block of a contribute form, will list the countries that start with a non-ascii caracter at the end of the list.

How to reproduce:

• enable all countries in CiviCRM locale config
• set the default interface language to French
• view the contribution form: in the list of countries, États-Unis (USA) will be amongst the last countries, instead of being after Estonie.

This seems to be caused by the fact that asort() does not respect the locale, in CRM/Core/PseudoConstant.php country().

I tried doing a setlocale(), but it did not work (even if my locales are set correctly on the operating system).

My fix was to use a PHP "Collator" class from the php5-intl package.

$lcMessages = CRM_Utils_System::getUFLocale();
$countries = CRM_Core_PseudoConstant::country();

$collator = new Collator($lcMessages . '.utf8');
$collator->asort($countries);

For more information, see the hook_civicrm_buildForm in https://github.com/mlutfy/civicrm_l10n/blob/master/civicrm_l10n.module

Given that this depends on the php5-intl package, I can understand that you might not want to depend on Collate for sorting, but it would be nice to have a hook so that it would be easier to override. Or code a CRM_Utils_Array::asort() ?