Small translation update (DEV) (#1742)

* Small translation update (DEV)

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

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

Co-authored-by: janetback <68653277+janetback@users.noreply.github.com>
Co-authored-by: Sabine Loss <44154356+SabineLoss@users.noreply.github.com>