Unable to answer "Do these traffic lights have a tactile indication for blind people for when it’s safe to cross?" – Crossing – https://osm.org/node/269997866 via StreetComplete 58.2:

Unsure. Not that I managed to find.

Attached photo(s):
https://westnordost.de/p/230470.jpg
https://westnordost.de/p/230471.jpg