Add fix for Rails deprecation warning
Add fix for Rails deprecation warning

I18n.enforce_available_locales defaults to true in >= 3.2.14.  Because
we don't have it explicitly set, a deprecation warning was displayed
warning about the change (previous default was false).

Set to false in the config to match the previous behavior.

CivicCommons/CivicCommons,CivicCommons/CivicCommons,CivicCommons/CivicCommons,CivicCommons/CivicCommons