He knows that.... he's translating to German.

The months should be in Generic.php
$ubbt_lang['MONTH1'] = "January";
$ubbt_lang['MONTH2'] = "February";
$ubbt_lang['MONTH3'] = "March";
$ubbt_lang['MONTH4'] = "April";
$ubbt_lang['MONTH5'] = "May";
$ubbt_lang['MONTH6'] = "June";
$ubbt_lang['MONTH7'] = "July";
$ubbt_lang['MONTH8'] = "August";
$ubbt_lang['MONTH9'] = "September";
$ubbt_lang['MONTH10'] = "October";
$ubbt_lang['MONTH11'] = "November";
$ubbt_lang['MONTH12'] = "December";