Step to reproduce it :
1) I have noticed the small i18n issue in the preside admin side notifications.
2) After login in the admin click the notifications->Configure Notifications->Global Configurations.
3) There is a title called 'Global notifications configuration' is shown.But the subtitle is shows only
4) The notifications i18n properties are inside cms.properties.
5) Just add i18n for 'subtitle' in cms properties.
For your reference I've attached the screen shot( notFoundLabel.png) of that issue.