<div id="comments"><h3><?php comments_number('<span>No</span> Comments', '<span>One</span> Comment', '<span>%</span> Comments' );?></h3></div>
shold probably be:
<div id="comments"><h3><?php comments_number(__( 'No Comments', 'site5framework'), __('1 Comment', 'site5framework'), __('% Comments', 'site5framework')); ?></h3></div>