I had the same question and used this workaround:
1. installed PHP Code for posts plugin
2. added the following code snippet to the plugin
<?php
//your code here!
echo "geschrieben am ";
the_time('j');
echo ". ";
the_time('F Y');
echo " in der Kategorie ";
the_category(', ');
echo ", ";
//comments_number( $zero, $one, $more );
comments_number( 'bislang keine Kommentare', '1 Kommentar', '% Kommentare' );
?>
3. Inserted an avia text element with the corresponding shortcode and span tag
<span class="post-meta-infos">[php snippet=1]</span>
For me that worked. Maybe one of you guys at Kriesi can correct my php code to display the proper international date version.
Regards
Richard