I modified the funtion in block_birthday.php to make it German by using strftime instead of date an LC_TIME
If some one knows how to get the Language variable can improve it.

<code>
function get_month_day($date, $format='ISO') {

$year = date('Y');

switch ($format)

{ case 'USA': $period = explode('.',$date); $month = $period[0]; $day = $period[1]; break; case 'ISO': $period = explode('-',$date); $month = $period[1]; $day = $period[2]; break; case 'EUR': $period = explode('.',$date); $month = $period[1]; $day = $period[0]; break; default : error('Invalid field type'); }

// $return = date('M d',mktime(0,0,0,$month,$day,$year));
setlocale(LC_TIME, 'de_DE.UTF8');
$return = strftime('%d. %B', mktime(0,0,0,$month,$day,$year));
return $return;

}
</code>