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/usr/share/squirrelmail/locale/ar/setup.php is in squirrelmail-locales 1.4.18-20090526-1.

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<?php
/**
 * Language configuration file
 *
 * Copyright (c) 2005-2009 The SquirrelMail Project Team
 *
 * This file is part of SquirrelMail webmail interface. It is distributed
 * together with other translation files and is used to enable 
 * translation.
 *
 * SquirrelMail 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.
 *
 * SquirrelMail 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 SquirrelMail; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * @version $Id: setup.php 13693 2009-05-14 00:26:43Z jervfors $
 * @package locales
 */

$languages['ar']['NAME']    = 'Arabic';
$languages['ar']['CHARSET'] = 'windows-1256';
$languages['ar']['DIR']     = 'rtl';