I happened to be looking into this bug too this weekend.
(By the way, my earlier comment about this affecting Ubuntu 16.04 with the GNOME3 Staging PPA is wrong because this was caused by the PackageKit 0.8 > 1.1 transition.)
Tim, maybe check-language-support does what we need instead of pk's what-provides (which apparently was never hooked up on Debian anyway).
I happened to be looking into this bug too this weekend.
(By the way, my earlier comment about this affecting Ubuntu 16.04 with the GNOME3 Staging PPA is wrong because this was caused by the PackageKit 0.8 > 1.1 transition.)
Tim, maybe check-language- support does what we need instead of pk's what-provides (which apparently was never hooked up on Debian anyway).
$ check-language- support -l fr_FR started- docs-fr hunspell-fr hyphen-fr language-pack-fr language- pack-gnome- fr libreoffice-help-fr libreoffice-l10n-fr mythes-fr wfrench
firefox-locale-fr gnome-getting-
$ check-language- support -l en_US
[no output since I have English (United States) installed]
$ check-language- support -l en_GB help-en- gb libreoffice- l10n-en- gb
hunspell-en-gb hyphen-en-gb libreoffice-
Fedora does have language packs and they show in GNOME Software> Addons> Localization.
Ubuntu and Debian's packagekit are in sync now and I believe they use the aptcc backend.