Locale fallback

[svoop]

The paid GeoIP city database from Maxmind often doesn't hold translations for cities. The IP address 88.162.113.13 is located in Les Angles, France. Here are the lookup results:

GeoIP2::locate '88.162.113.13', 'fr'
=> {"city"=>nil,
 "city_geoname_id"=>3002160,
 "country"=>"France",
 "country_geoname_id"=>3017382,
 "country_code"=>"FR",
 "continent"=>"Europe",
 "continent_code"=>"EU",
 "continent_geoname_id"=>6255148,
 "subdivision"=>"Région Languedoc-Roussillon",
 "subdivision_code"=>"K",
 "subdivision_geoname_id"=>3007670,
 "postal_code"=>"30133",
 "latitude"=>42.5788,
 "longitude"=>2.0739,
 "time_zone"=>"Europe/Paris"}

GeoIP2::locate '88.162.113.13', 'en'
=> {"city"=>"Les Angles",
 "city_geoname_id"=>3002160,
 "country"=>"France",
 "country_geoname_id"=>3017382,
 "country_code"=>"FR",
 "continent"=>"Europe",
 "continent_code"=>"EU",
 "continent_geoname_id"=>6255148,
 "subdivision"=>"Languedoc-Roussillon",
 "subdivision_code"=>"K",
 "subdivision_geoname_id"=>3007670,
 "postal_code"=>"30133",
 "latitude"=>42.5788,
 "longitude"=>2.0739,
 "time_zone"=>"Europe/Paris"}

As you see, no city name is returned when a French city is queried with locale "fr", however, it is returned with locale "en". The consumer of your gem can only deal with this situation by performing a second lookup. Not so good!

Would it be possible to add a fallback setting such as:

GeoIP2::fallback_locale 'en'

If set, a lookup which finds a city (city_geoname_id is present) but no city name in the queried locale returns the city name in the fallback locale.

[svoop]

(I usually code and submit pull requests myself, but unfortunately I'm not much of a C programmer.)