This looks to be an Ubuntu translation error. The current package of language-pack-gnome-en-base has some German phrases in its en_GB translations for deja-dup!
Looks like they were fixed in May in the Ubuntu translation sources: https://translations.launchpad.net/ubuntu/hirsute/+source/deja-dup/+pots /deja-dup/en_GB/+translate But that hasn't made it back into 21.04 yet. :-/ ** Project changed: deja-dup => deja-dup (Ubuntu) ** Changed in: deja-dup (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to deja-dup in Ubuntu. https://bugs.launchpad.net/bugs/1933717 Title: Backup messages in wrong language Status in deja-dup package in Ubuntu: Confirmed Bug description: My system is set to use UK English, and has never used German. When a backup completes I get the mixed language message: Backup Finished Aber nicht alle Dateien wurden erfolgreich gesichert See the attached screenshot. Ubuntu 21.04 Deja dup version 42.7 $ dconf dump /org/gnome/deja-dup/ [/] backend='google' delete-after=182 last-backup='2021-06-26T10:00:30Z' last-run='2021-06-26T09:12:53Z' nag-check='2021-06-16T10:40:36Z' periodic=true periodic-period=1 prompt-check='disabled' [file] migrated=true [gcs] folder='anthony-System-Product-Name' [goa] type='google' [google] folder='Ubuntu-backups' [local] folder='anthony-System-Product-Name' [openstack] container='anthony-System-Product-Name' [rackspace] container='anthony-System-Product-Name' [remote] folder='anthony-System-Product-Name' [s3] folder='anthony-System-Product-Name' $ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/deja-dup/+bug/1933717/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp