SAK-26163 Update notification label on access changes.

When switching between site/group announcements the email notification label should update to show the notification will only go to the group members rather than still indicating it goes to the whole site.

git-svn-id: https://source.sakaiproject.org/svn/announcement/trunk@308892 66ffb92e-73f9-0310-93c1-f5514f145a0a