Fix small typos and remove RKI Hotline (EXPOSUREAPP-2633) (#1318)

* Update terms_de.html

Small corrections to EULA (::1664-00|20::) from law office

* Remove RKI Hotline (EXPOSUREAPP-2633)

Co-authored-by: Sabine Loss <44154356+SabineLoss@users.noreply.github.com>