Post Detail Custom Fields - Fixes T131

Summary:
* styles post detail custom fields
* fixes T131

In order to fully test, I need more custom filed data.

I am not in love with the post detail layout. @digitalafrican, @sebm90 and I are talking ui this week and this layout may be affected. I will revisit after that conversation.

Test Plan:
* load post detail page
* add data to custom form fields
* check styles on output

Reviewers: shadowhand, rjmackay

Reviewed By: shadowhand, rjmackay

Subscribers: bodacea, digitalafrican, sebm90, dkobia

Maniphest Tasks: T131

Differential Revision: https://phabricator.ushahidi.com/D187