Add a new "locked" status to the extension statuses.
Add a new "locked" status to the extension statuses.

LOCKED is used after an extension is submitted but before it is reviewed,
and cannot be edited except for deleting the version entirely.

GNOME/extensions-web,magcius/sweettooth,GNOME/extensions-web,magcius/sweettooth,GNOME/extensions-web,GNOME/extensions-web