Use get_comments_number() in comments_bubble() method. Removes chance of...

Use get_comments_number() in comments_bubble() method. Removes chance of sprintf arguments error due to percent encoding in URLs and kills unnecessary translations. Escape translations into attributes. esc_url on admin_url. fixes #16611 for trunk.

git-svn-id: https://core.svn.wordpress.org/trunk@17475 1a063a9b-81f0-0310-95a4-ce76da25c4cd