use the UTF-8 character set instead.
make sure the meta tag is set to utf-8 and also update the Connectsion/PowerCMSConnections.php file to use the UTF-8 character set.
change:
$PowerCMSConnection = mysql_pconnect($hostname_PowerCMSConnection, $username_PowerCMSConnection, $password_PowerCMSConnection) or trigger_error(mysql_error(),E_USER_ERROR);
to:
$PowerCMSConnection = mysql_pconnect($hostname_PowerCMSConnection, $username_PowerCMSConnection, $password_PowerCMSConnection) or trigger_error(mysql_error(),E_USER_ERROR);
mysql_set_charset('utf8',$PowerCMSConnection);
the utf 8 character set can display the german characters as well as the ISO-8859-1 one can