Confusing role nomenclature

[itsrachelfish]

When creating an event, admins and department leads are expected to create "shifts" for their department which are actually better described as "roles". (Eg: Supervisor, Volunteer, Shuttle Pilot) However, the name "roles" was already taken by the user permissioning system.

In order to make the user experience less confusing, "user roles" should be renamed to "user permissions", and "department shifts" should be renamed to "department roles".