in version 3.4.4 edit bfa_custom_coments.php change line 23 from
HTML Code:
<?php printf(__('%1$s at %2$s','atahualpa'), get_comment_date(__('F jS, Y','atahualpa')), get_comment_time()) ?></a>
to
HTML Code:
<?php printf(__('%1$s @ %2$s','atahualpa'), get_comment_date(__('F jS, Y','atahualpa')), get_comment_time()) ?></a>