Update legal_strings.xml (EXPOSUREAPP-2942) (#1417)

* Update legal_strings.xml

* Update Corona-Warn-App/src/main/res/values-de/legal_strings.xml

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

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