I don't know why it's not working. This is Ubuntu's patch that adds the string.
https://bazaar.launchpad.net/~ubuntu-desktop/gnome- software/ubuntu/view/head:/debian/patches/0001-Construct-the-Software- Sources-menu-item-dynamically.patch ** Also affects: ubuntu-translations Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-software in Ubuntu. https://bugs.launchpad.net/bugs/1702522 Title: "Software & Updates" string not marked for translation in Ubuntu 17.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-translations/+bug/1702522/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs