[pmwiki-users] Case insensitive seach using UTF-8 and non-Latin chars

[Athan]

My intranet pmwiki installation works great with both English and Greek 
content but case insensitive searching works only with English characters.

BTW I already use xlpage-utf-8.php in config.php and 'xlpage-i18n' => 'utf-8' 
in XLPage.

Is there anything I can do to allow searching case insensitivity in both 
languages?

Thanks