Fixed cp/build/vocab for files #2033

HTML and undefined are no longer selectable.
Select2 has headings: Posts and Files.
Moved sv list vocab into own fieldset under content #2033
Content/display/sort are on one line.  More link options too #2033
Video indicator hover change #2033

List of videos in teaser display had separate links for title and thumbnail.  This wasn't very obvious.  Now the thumbnail link differentiates itself by changing the video-indicator icon when its hovered over.  Hovering on the title link does not change the icon.  This should make it apparent the links aren't the same.
Merge branch 'SCHOLAR-3.x' into 2033-lof_final
Fixed sv list form #2033

Terms weren't saving correctly.  Form value was expecting vocabs to be nested under a vocabs array and that wasn't hpapening.  Thanks for catching it, travis!
Merge pull request #4725 from openscholar/2033-lof_final

2033 lof final