Bug 32035: Add "Koha" to the staff interface home page

Bug 32035: Add "Koha" to the staff interface home page

Currently the staff interface does not include Koha before the version
number shown on the home page.

Test plan:
1. Log in and view the staff interface home page.
2. In the bottom right-hand corner "Version 22.06.00" is shown.
3. Apply the patch.
4. Refresh the staff interface home page.
5. It now shows "Koha 22.06.00" (linked to the Koha website).
6. Sign off :D (or comment on alternative options).

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Claude Demeure <claude.demeure@mailo.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>