Make default and hidden columns in Workboards more clear

Summary: Fixes T6469. Changes the default icon into text instead. Added the text to hidden boards and now display when reordering as well.

Test Plan:
Moved a bunch of columns, tested reordering. Seems more clear.

{F229626}

{F229627}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6469

Differential Revision: https://secure.phabricator.com/D10784
Update Font Awesome .woff path

Summary: We're having trouble with this pointing at the wrong file after D10778; I assume that making it match the others is the proper fix...

Test Plan: Crossed fingers.

Reviewers: epriestley, #blessed_reviewers, chad

Reviewed By: #blessed_reviewers, chad

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10785
Merge branch 'master' of github.com:facebook/phabricator