[diego] - Update locale on API calls

Locale was moved from ACCEPT-LANGUAGE header into URL on the Platform
API, which required updating ActiveResource settings to match the new
URLs.
[diego] - Fix bug on action page's member fields request

The API call which requested the fields that should be displayed on the
action page ask module was not setting the locale correctly on the URL.
Added that URL parameter.
[diego] Bumped version

Updated gem version to 0.8.7