Validate all input fields before save (and don't save invalid data)
(#10)
Show validation errors in tooltip
(#10)
Show notification tooltip after small delay to reflect UI changes
(#10)
Don't show notification tooltip outside window
(e.g. in case of error in not visible field: we scroll to one error and may hide something)
(#7, #10)
Localize "Empty name" error
(#5, #10)