Add code mww-latn

Per request at
https://translatewiki.net/wiki/Thread:Support/Request_to_approve_new_languge:_Hmong_Dawb_%28MWW%29

Change-Id: Id542d6ea2b3b09563dd456139d039c165db31e9d
ExpandTemplates was added to core

Change-Id: I59dc44855a4c8aa4b81f7e9ae4d7bda8874009c2
Merge changes I59dc4485,Id542d6ea

* changes:
  ExpandTemplates was added to core
  Add code mww-latn