Cleaned up Zero regexes

Made all Zero regexes in the same format:

   "^((lang|lang|lang)\.)?(m|zero)\."  -- both subdomains
   "^((lang|lang|lang)\.)?m\." -- m only

Change-Id: If738671dc7a85ee0a361bdd219b0086cd1b6a279
Merge "Cleaned up Zero regexes" into production