That's the German constitution though. Has no effect outside Germany and so cannot be a fundamental human right - just a fundamental German right. Also, who gets to define "dignity"? Can I end my life in a dignified way if there is no other choice? Not in Germany I can't.
There are no fundamental right, no inviolable rights. There are rights bestowed upon us by societies, but not all societies agree on any single aspect of what is a fundamental or inviolable right. Therefore there is no such thing as a fundamental or inviolable human right.