UP-3870: Fix Universality themes : add missing sass changes defined in css files ; add missing css changes defined in sass files ; add missing images

- Add missing css changes defined in sass files (see UP-3762 commit https://github.com/auxepaul/uPortal/commit/df4eb3e70)
- Add missing sass changes defined in css files and regenerate css (@see UP-3750 commit a63ad54 ; commit 51f7d2f : Solve CSS issue about lock icon in portlet title...)
- Add missing images of hc and coal themes (gripper.png and portal_powerdby.png)
- Fix missing sort.png and padding-right error on toolbar of portlets administration