add username to team_member page
Created by: jouve
Since #2208, user are referenced with User#username in GFM. User#username is not displayed in the the app so I added it to team_member page.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: jouve
Since #2208, user are referenced with User#username in GFM. User#username is not displayed in the the app so I added it to team_member page.