Build with gnome-pkg-tools for Ubuntu language packs

Jeremy Bícharequested to merge
jbicha/webkit:ubuntu-langpack into wk2/unstable

On Ubuntu, dh_gnome runs dh_translations which is needed for Ubuntu language packs.

The dh_gnome_clean override is because we don't use debian/control.in like Debian GNOME packages do.

Pinging @berto since I don't know if you're Watching this repository yet.

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