Refactor sign out button to a proper form so it can handle redirects
Implement more advanced user management in the administration UI.

- CSV Import of users
- Create new user functionality
- New `User management` navigation item that shows a list of users in the current tenant
- When a user in the list is clicked it brings up the manageuser widget that allows editing the user's profile information, password and privileges
- Added new `User management` navigation item in the global admin panel as well that shows the users in the tenant
- Added new `Maintenance` navigation item in the global admin panel
- Added the ability to create a new global administrator (sort of, initial implementation, you can create a new user on the global administration tenant and then afterwards promote it to global admin by going into the settings for the user)
- Regenerate previews
    - Reprocess specific mime types
    - Reprocess failed content previews
    - Reprocess everything in date range
    - Reprocess for a specific user
    - Reprocess all items of specific content type
- Reindex search
Move around some translations to the main bundles
Follow up on user management review
Consistency updates for progress bars, tweaks to QUnit untranslated keys test, add failure handling in the changepic widget, rename maintenance to servermaintenance
Follow up on user management review
Merge branch 'master' of https://github.com/oaeproject/3akai-ux into userManagement
Follow up on user management review
Merge branch 'master' of https://github.com/oaeproject/3akai-ux into userManagement
Merge branch 'master' of https://github.com/oaeproject/3akai-ux into userManagement
Make visual changes to the maintenance widget
Users created on global admin are global administrators by default, creating a user on a regular tenant gives the option of making the user a tenant admin
Logout follow-up

 * Removed oae.api.authentication.logout function
 * Changed sign out button in the admin ui
Replace api.logout with logout form/button in the terms and conditions widget
Merge pull request #3768 from simong/cas-logout

Refactor sign out button to a proper form so it can handle redirects
Synchronized Spanish translation
Merge branch 'master' of https://github.com/oaeproject/3akai-ux
Merge origin/master and fix conflicts
Prepare create user API while waiting for REST endpoints to be finished, follow up on code review
Minor tweaks to createuser endpoints for user management