Problem: Cockpit name deemed meaningless (& borderline offensive)

See user feedback:

https://gitlab.com/exosphere/exosphere/wikis/user-testing/person-a

"Cockpit is a weird name" "I don't like Cockpit" "I like (Cockpit). But I don't like it's name

Also:

https://cockpit-project.org/ideals.html#cockpit-is-only-the-project-name

People using Cockpit should feel they are interacting with the underlying Server OS. Cockpit can look different on different operating systems, because it’s the UI for the OS, and not an external tool.

Thus the UI should never actually show the ‘Cockpit’ name, but call the server by its name or operating system.

Solution: Replace occurrences of 'Cockpit' in the user interface with 'Dashboard'

Fixes #138 (closed)