@aral
That escalated quickly. From one protest in Germany being broken up to an EU-wode comment.
In the article, it's clear that languages can be used at protests, if there is an interpreter ...to ensure there's no incitement to terrorism. IMO, that's a worthy goal - and a reasonable limitation.
This group knew the law, chose not to have an interpreter (altho it seems it had many polyglots) and got the inevitable result. To me, it seems like they were aiming for a headline.