Grégory, I think this ITA got stuck because you need to find a sponsor. Please see https://mentors.debian.net/ which should help you find a sponsor.
I don't plan to sponsor this package, but I did happen to notice a few things. Please keep the old debian/changelog entries, especially since luakit was never removed from Debian completely (it's still in unstable). The most recent debian/changelog entry should say that you are adopting this packaging and close this bug. Also, please describe in debian/changelog any other changes you've made to the packaging (for instance, changing the webkitgtk dependency). Please use the Vcs-Git and Vcs-Browser fields in debian/control to specify the git repo where the packaging is maintained. Thanks, Jeremy Bicha