Lorentz l10n trees are dealt with

The project tree for Lorentz is winding down at various places, and the l10n dashboards make no difference.

The l10n builds off of the projects/firefox-lorentz project tree named "lorentz" have been stopped, and the sign-offs are closed.

Sign-offs for the ongoing work on 3.6.x including the lorentz strings should now go back onto the fx3.6 app version. Sign-offs from the lorentz tree have been migrated to fx3.6 where it made sense to me.