Fix some issues reported by lintian

See merge request !3

Changes-By: lintian-brush
Fixes: lintian: out-of-date-standards-version
See-also: https://lintian.debian.org/tags/out-of-date-standards-version.html

Changes-By: lintian-brush
Fixes: lintian: older-debian-watch-file-standard
See-also: https://lintian.debian.org/tags/older-debian-watch-file-standard.html

Set upstream metadata fields: Repository, Repository-Browse

See merge request !2

Fixes: lintian: upstream-metadata-file-is-missing
See-also: https://lintian.debian.org/tags/upstream-metadata-file-is-missing.html


Fixes: lintian: upstream-metadata-missing-repository
See-also: https://lintian.debian.org/tags/upstream-metadata-missing-repository.html

Add patch 0001-Refresh-translations.patch from upstream commit https://git.launchpad.net/lightdm-gtk-greeter-settings/commit/?id=69e614899be17816d1cc8ce658d95d6731b83bd7

Thanks to Roxfr for suggesting translation updates.

Bug: https://bugs.debian.org/896731

This reverts commit c035e106.