LPS-34669 - Add visual grouping of repeatable fields in the web contents

Hey @brunobasto,

Attached is an update for http://issues.liferay.com/browse/LPS-34669.  I sent this to you since I had to make a change to something you added for https://github.com/liferay/liferay-portal/commit/b5adea83c579d59a1420385880b9b108e07440cc#L8R174.  If everything is good, can you send this along to Nate?

Please let me know if you have any questions.  Thanks!