Display Administrator badge on a circle admin name in the conversation panel

What needs to be done?

When I click on the information panel of a circle, I clearly see who is the administrator

This information should also be displayed in the conversation panel, right near the admin name.

Just like in Rocket Chat

Technical details

Think that other roles than "Administrator" could come afterwards

Test cases

1. Create a new circle
2. Post some text in the conversation panel
3. Check that "Administrator" appears near your name