PHP setlocale funkcija

V PostNuke sem dodal modul PostCalendar, lepo prevedel vse v slovenščino, sedaj pa imam manjšo težavo s prikazom imenov dni in mesecev v slovenščini. Po malce surfanja sem ugotovil, da moram n global.php (datoteka je del PostCalendarja, ne PHP-ja) nastavit jezik v slovenščino. Načeloma brez problema, jest sem pa kljub temu uspel naletet na enega.
Tole je koda:

**
* $Id: global.php,v 1.15 2002/12/19 20:09:09 iansym Exp $
*
* PostCalendar::PostNuke Events Calendar Module
* Copyright Š 2002 The PostCalendar Team
* http://postcalendar.tv
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* To read the license please read the docs/license.txt or visit
* http://www.gnu.org/copyleft/gpl.html
*
*/

//=========================================================================
// The following define is necessary for the date and time functions
// set it to the locale for this language
//=========================================================================
define('_PC_LOCALE','si_SVN');
//=========================================================================
// Defines used in all files
//=========================================================================
// new in 3.9.9
define('_PC_NOTIFY_ADMIN', 'Obvesti admina o spremebah ali novih dogodkih?');
define('_PC_NOTIFY_EMAIL', 'Admin Email naslov');

Težavna je vrstica define ('_PC_LoCALE','...);

A kdo za hudiča ve, kaj je treba vnest tam notr?

Hvala za pomoč.

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