Deserializer for geocoder language json fields.

[cammace]

#512 adds support for requesting multiple languages but the response currently isn't handling additional json fields text_{language}, place_name_{language} and language_{language} since the field name depends on different languages. We will need to use a custom deserializer to handle these different fields.

cc: @zugaldia

[stale]

This issue has been automatically detected as stale because it has not had recent activity and will be archived. Thank you for your contributions.

[zugaldia]

No need to reopen, this is being tracked here: #446 (comment).