Add comments count to title & show comments title if comments count !=0

Replace in comment-wrapper.tpl.php (/sites/all/modules/comment_bonus_api/)

<?php if ($node->type != 'forum'): ?>
    <h2 class="comments"><?php print t('Comments'); ?></h2>
  <?php endif; ?>

to

<?php if ($node->type != 'forum' && $node->comment_count != 0): ?>
    <h2 class="comments"><?php print t('Comments') .' ('. $node->comment_count.')'; ?></h2>
  <?php endif; ?>