Added <label> to 'date' fields

git-svn-id: https://plugins.svn.wordpress.org/timed-content/trunk@817925 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added changes to customFieldsInterface.php to changelog

git-svn-id: https://plugins.svn.wordpress.org/timed-content/trunk@817926 b8457f37-d9ea-0310-8a92-e5e31aec5664