- users form partial on the Administrators tab of the role update form,
served by rolesAdmin.PartialData through scopeAdministrators (D-03)
- deleted and deactivated holders marked, superusers only for superuser
editors, first 100 rows with a count note, preview links for editors
holding backend.manage_users
- en/pl phrases, README and docs, TestRolesSmoke asserts the partial
- Settings -> System -> Roles (summercms.cabana.roles, backend.manage_roles,
order 110): name, code slugged from the name, description, checkbox
permission editor with the editor's ceiling
- system roles (is_system or code-declared grants) keep their code and
cannot be deleted; a role any admin holds (deleted ones included) cannot
be deleted, the refusal names the role and the count
- role codes unique among roles
