Grepping through the ubiquity sources, it seems that this message is already marked as translatable:
d-i/source/grub-installer/debian/grub-installer.templates:_Description: Device for boot loader installation: d-i/source/grub-installer/debian/po/templates.pot:msgid "Device for boot loader installation:" d-i/source/yaboot-installer/debian/po/templates.pot:msgid "Device for boot loader installation:" d-i/source/yaboot-installer/debian/yaboot-installer.templates:_Description: Device for boot loader installation: Perhaps the updated template has not yet been uploaded? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/703805 Title: "Device for bootloader installation" chain not localized -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs