hi cboita,
its not a shopware problem.
$month = date('F');
echo $month;
_‚F‘ A full textual representation of a month, such as January or March -> January through_December
http://php.net/manual/en/function.date.php
You have to translate it by your own, like :
$lang = 'de';
$translate['de'] = array('Januar', 'Februar', 'März', ...);
$translate['en'] = array('January', 'February', 'March', ...);
$month = date('n');
echo $translate[$lang][$month-1];
you could do it with a plugin or try it with smarty.
smarty modifier: Modifiers | Smarty
example:
{$sArticle.displayDate|my_date_formate:'de'}