NL Internationalization E-commerce

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Hi folks,

I am trying to localize my e-commerce module to Dutch.
I downloaded the language pack (.po and .mo files) and placed it into
/concrete/packages/core_commerce/languages/nl_NL/LC_MESSAGES/

I modified config/site.php with define('ACTIVE_LOCALE', 'nl_NL');
also tried define ('LOCALE', 'nl_NL');

However, nothing works. Cleared cash, reloaded apache, turned off the PC :)
DOES NOT WORK. everything is still in english.
Any suggestion is much appreciated.

Happy holidays!

Mik