Problem/Motivation
When using the minimal install profile, no administrator role is created. To manually create an administrator role, you must first add the role, then set the administrator role in role settings. A user who clicks "Save configuration" is not given a status message that the save was successful.
Steps to reproduce
Install Drupal using the minimal profile.
Create a role named "Administrator" at /admin/people/roles
Set the "Administrator" to the administrator role at /admin/people/role-settings and click "Save configuration".
No message is presented making it feel like nothing happened.
Proposed resolution
Add a status message to a successful role setting save: "The role settings have been updated." (Incidentally, this is the exact message that appears when saving /admin/people/roles. That message should probably be "The roles have been updated." )