Comment 1 for bug 1585575

Thanks for taking your time to report this issue and help making Ubuntu better.

I found https://translations.launchpad.net/ubuntu/xenial/+source/grub2/+pots/grub/de/131/+translate which seems to be the string in question. You can add a translation suggestion. Once approved by someone from the German translation team (https://launchpad.net/~ubuntu-l10n-de), the latest translation will be synced from Launchpad to the package at some point in the future.