[NX-354] Notification settings
[NX-354] Drop useless method
[NX-354] Change label of notified roles
[NX-354] Use GStrings
Merge remote-tracking branch 'origin/master' into NX-354-notification-settings

Conflicts:
	plugins/rapture/nexus-coreui-plugin/src/main/resources/static/rapture/NX/coreui/controller/System.js
Merge pull request #458 from sonatype/NX-354-notification-settings

REVIEW: [NX-354] Notification settings