Hide the notification after the css animation has finished
Hide the notification after the css animation has finished

This will solve the problem that the notification stayed as an invisible overlay.
fixes #1578

carakas/forkcms,jonasdekeukelaere/forkcms,bartdc/forkcms,jacob-v-dam/forkcms,vytsci/forkcms,dmoerman/forkcms,DegradationOfMankind/forkcms,jeroendesloovere/forkcms,jacob-v-dam/forkcms,justcarakas/forkcms,DegradationOfMankind/forkcms,jessedobbelaere/forkcms,riadvice/forkcms,carakas/forkcms,Katrienvh/forkcms,DegradationOfMankind/forkcms,carakas/forkcms,jeroendesloovere/forkcms,jacob-v-dam/forkcms,carakas/forkcms,jessedobbelaere/forkcms,sumocoders/forkcms,sumocoders/forkcms,riadvice/forkcms,tommyvdv/forkcms,vytenizs/forkcms,sumocoders/forkcms,forkcms/forkcms,bartdc/forkcms,mathiashelin/forkcms,vytsci/forkcms,tommyvdv/forkcms,riadvice/forkcms,vytenizs/forkcms,vytenizs/forkcms,tommyvdv/forkcms,jonasdekeukelaere/forkcms,Katrienvh/forkcms,Thijzer/forkcms,jessedobbelaere/forkcms,mathiashelin/forkcms,sumocoders/forkcms,dmoerman/forkcms,jonasdekeukelaere/forkcms,Katrienvh/forkcms,DegradationOfMankind/forkcms,Katrienvh/forkcms,forkcms/forkcms,sumocoders/forkcms,Thijzer/forkcms,mathiashelin/forkcms,carakas/forkcms,jonasdekeukelaere/forkcms,mathiashelin/forkcms,jessedobbelaere/forkcms,forkcms/forkcms,forkcms/forkcms,jeroendesloovere/forkcms,riadvice/forkcms,dmoerman/forkcms,Thijzer/forkcms,bartdc/forkcms,jonasdekeukelaere/forkcms,justcarakas/forkcms,jacob-v-dam/forkcms,justcarakas/forkcms,vytsci/forkcms,tommyvdv/forkcms,jeroendesloovere/forkcms