How significant are AfD's historic gains for Germany and the rest of Europe?

https://www.bbc.co.uk/news/articles/c986w38r4j5o

Europe wrestles with impact of historic regional gains for Germany’s AfD - BBC News
www.bbc.co.uk

Europe wrestles with impact of historic regional gains for Germany’s AfD - BBC News

The BBC's Europe editor Katya Adler sees the far-right win in Saxony-Anhalt state ringing alarm bells for the EU and traditional parties.