Add "useLocalConfig" variable and respect it

The ParsoidConfig now has an option that makes us use local configuration
files stored in lib/baseconfig. Oh, and those exist now, too. The English
one is the same (or similar) as our BaseConfig, so we can remove that now.

Change-Id: I34b44ec57cc82ccf2f78d86162ea231d8dcea2aa
Merge "Add "useLocalConfig" variable and respect it"