template_tags: add format_code_lang from wp-admin/includes/ms.php

git-svn-id: https://plugins.svn.wordpress.org/feedly-insight/trunk@848367 b8457f37-d9ea-0310-8a92-e5e31aec5664
0.3.2 bump

git-svn-id: https://plugins.svn.wordpress.org/feedly-insight/trunk@848368 b8457f37-d9ea-0310-8a92-e5e31aec5664