The same problem. What I have found:
To correct russian text display on Windows
--------- SysInfo -------------------------
E:\ProgramF\eGroupWare\phpsysinfo\includes\lang\ ru.php
convert to KOI8-R
--------- Gantt Chart ---------------------
E:\ProgramF\jpgraph\src\jpg-config.inc.php
set
DEFINE(“LANGUAGE_CYRILLIC”,true);
DEFINE(“CYRILLIC_FROM_WINDOWS”,true);
DEFINE(‘LANGUAGE_CHARSET’, ‘utf-8’);
E:\ProgramF\eGroupWare\projectmanager\inc\class.ganttchart.inc.php
set
var $gantt_charset = ‘utf-8’;
in
function text_encode($text)
comment line
// $text = preg_replace(’/[^\x00-\x7F]/e’, ‘"&#".ord("$0").";"’,$text);
and to see months at least in english (not found way to russian)
$graph->scale->SetDateLocale(‘en’); //SetDateLocale($this->guess_locale());