Added support for localization of address fields

Supports different address formats via country code (works similar to imperial units for maxspeed fields)

More countries can be easily added via geojson.io (e.g.: with the poly files found at http://download.geofabrik.de).

An alternative way to get the country code for a location would be a thirdparty service like nominatim or geonames (drawback - server load and latency).
You need to make use of the update and exit selections here to handle the case where the address format is different than the last location.