Bug 32973: Use template wrapper for breadcrumbs: about, main, and error page

Bug 32973: Use template wrapper for breadcrumbs: about, main, and error page

This patch updates the staff interface home page, the about page, and
the error page template so that they use the new template WRAPPER for
breadcrumbs.

To test, apply the patch and view each page to confirm that the
breadcrumbs are correct:

- Staff interface home page
- About page
- Error page (the easiest example is a 404 error)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>