CAMBWP-237 - Add message banner

https://uniofcam.atlassian.net/jira/software/projects/CAMBWP/boards/325?assignee=557058%3A6f5929f5-c170-4f33-844f-4c1749d9e53f&selectedIssue=CAMBWP-237

Information is in ticket - use module message_banner,