bug 1273028: Add registration_disabled notice
bug 1273028: Add registration_disabled notice

With the login dropdown removed and login choices simplified, there is
no good place to put a "profile creation disabled" notebox in the login
bar. Instead, put it on the "Please sign in" page, where visitors are
mostly likely to see it.

mozilla/kuma,a2sheppy/kuma,safwanrahman/kuma,Elchi3/kuma,jwhitlock/kuma,Elchi3/kuma,Elchi3/kuma,yfdyh000/kuma,SphinxKnight/kuma,SphinxKnight/kuma,jwhitlock/kuma,jwhitlock/kuma,safwanrahman/kuma,escattone/kuma,escattone/kuma,SphinxKnight/kuma,safwanrahman/kuma,safwanrahman/kuma,yfdyh000/kuma,yfdyh000/kuma,yfdyh000/kuma,jwhitlock/kuma,jwhitlock/kuma,a2sheppy/kuma,a2sheppy/kuma,yfdyh000/kuma,mozilla/kuma,escattone/kuma,mozilla/kuma,mozilla/kuma,Elchi3/kuma,a2sheppy/kuma,SphinxKnight/kuma,SphinxKnight/kuma,safwanrahman/kuma,mozilla/kuma,a2sheppy/kuma,SphinxKnight/kuma,yfdyh000/kuma,safwanrahman/kuma,Elchi3/kuma