typo fix in localization

Author: Cookiezaurs

frontend/express/public/localization/dashboard/dashboard.properties

@@ -358,7 +358,7 @@ events.edit.event-visible = Event is visible
 events.edit.event-visible-description = If an event is invisible server will continue to record data for it but it will not be displayed in the user interface.
 events.edit.display-count = Display name for count
 events.edit.display-count-description = A display name for the count property of this event
-events.edit.display-sum = Dsiplay name for sum
+events.edit.display-sum = Display name for sum
 events.edit.display-sum-description = A display name for the optional sum property of this event
 events.edit.display-duration = Display name for duration
 events.edit.display-duration-description = A display name for the optional duration property of this event.