Fix various in the user role management UI (#18777)

* Reword priority description

* Disable checkboxes for permissions you can't enable in role edition interface

* Set max priority in HTML attribute

* Explicitly link to role edition, do not link when you can't edit

* Reword priority description based on review

app/views/admin/roles/_role.html.haml

@@ -1,12 +1,22 @@
 .announcements-list__item
-  = link_to edit_admin_role_path(role), class: 'announcements-list__item__title' do
-    %span.user-role{ class: "user-role-#{role.id}" }
-      = fa_icon 'users fw'
+  - if can?(:update, role)
+    = link_to edit_admin_role_path(role), class: 'announcements-list__item__title' do
+      %span.user-role{ class: "user-role-#{role.id}" }
+        = fa_icon 'users fw'
 
-      - if role.everyone?
-        = t('admin.roles.everyone')
-      - else
-        = role.name
+        - if role.everyone?
+          = t('admin.roles.everyone')
+        - else
+          = role.name
+  - else
+    %span.announcements-list__item__title
+      %span.user-role{ class: "user-role-#{role.id}" }
+        = fa_icon 'users fw'
+
+        - if role.everyone?
+          = t('admin.roles.everyone')
+        - else
+          = role.name
 
   .announcements-list__item__action-bar
     .announcements-list__item__meta
@@ -16,3 +26,5 @@
         = link_to t('admin.roles.assigned_users', count: role.users.count), admin_accounts_path(role_ids: role.id)
         •
         %abbr{ title: role.permissions_as_keys.map { |privilege| I18n.t("admin.roles.privileges.#{privilege}") }.join(', ') }= t('admin.roles.permissions_count', count: role.permissions_as_keys.size)
+    %div
+      = table_link_to 'pencil', t('admin.accounts.edit'), edit_admin_role_path(role) if can?(:update, role)