new: util.clojure/trim-prefix and expectations
new: revamp modal dialogs display and enable chooser dialog

- Enable chooser dialog.
- Disable username links when in chooser to prevent link outside the
  chooser.
- Open Chooser by default on the current set up image module.
- Enable root breadcrumb on welcome page on chooser.
- Localize choose reference cell button.
- Localize text-muted on save-dialog.
- ALT+ENTER to save with commit.
- Focus on commit message text area.
- Customize the message of the delete dialog for each page
  (deployment, image, user...)
- Added several util fns in clj and js sides.
fix: do not display 'users' segment of breadcrumbs if not super

Instead of 'home/user/foo' we now display 'home/Your profile' for non
super users.