Right, there is no official or mandatory dispatcher licence in europe.
However, if you apply for a job you most likely will be asked for a licence and experience time.
I recommend getting a FAA licence (Sheffield in Ft.Lauderdale, FL also gives you good training and is well known as one of the best dispatcher schools).
As far as I know Lufthansa is not offering any dispatcher courses anymore, but I am not 100% sure.