go to

" includes/libs/common.inc.php "

0pen and Search this code

[code]
if ($type == 'date'){
return gmdate($settings['date_format'],$timeline);
}
else {
if(gmdate("j",$timeline) == gmdate("j",$current)) {
return $settings['date_today'].', '.gmdate($settings['time_format'],$timeline);
}
elseif(gmdate("j",$timeline) == gmdate("j",($current-3600*24) ) ) {
return $settings['date_yesterday'].', '.gmdate($settings['time_format'],$timeline);
}
return gmdate($settings['date_format'].', '.$settings['time_format'],$timeline);
}
}
[/code]

Change it

[code]
if ($type == 'date'){
return gmdate($settings['date_format'],$timeline);
}
else {
if(gmdate("j",$timeline) == gmdate("j",$current)) {
return $settings['date_today'].''.t('Today').' '.gmdate($settings['time_format'],$timeline);
}
elseif(gmdate("j",$timeline) == gmdate("j",($current-3600*24) ) ) {
return $settings['date_yesterday'].''.t('Yesterday').' '.gmdate($settings['time_format'],$timeline);
}
return gmdate($settings['date_format'].', '.$settings['time_format'],$timeline);
}
}
[/code]
good luck