Unable to answer "What’s the topic of this information board?" – Information Board – node/10011250227 via StreetComplete 60.3:

Lageplan mit Legende für das Evangelische Krankenhaus Königin Elisabeth Herzberge

Unable to answer "What diameter is specified on the sign for this fire hydrant?" – Pillar Fire Hydrant – node/10032947108 via StreetComplete 60.3:

Schild nicht für Hydrant sondern für Wasser.

Attached photo(s):
https://streetcomplete.app/p/274459.jpg