Gantt chart issue completely resolved

I finally found how to fix the Gantt chart issue completely. It IS a bug of version 2.0.1 The solution comes from here and is the following (original text preserved):

open modules/tasks/gantt.php an modify line 137 like down below for instance until I have sorted out with the concnering developer what to do:

// This configuration variable is obsolete = line 137
$jpLocale = dPgetConfig( 'jpLocale' );
if ($jpLocale) {
$graph->scale->SetDateLocale( $jpLocale );
}
//$graph->scale->SetDateLocale( $AppUI->user_locale );