Nominatim was never given a language, so place names in wx, gwx and other location replies came back in each place's local language ("千代田区, JP" for Tokyo). Forward and reverse lookups now pass [Localization] language, with English as the fallback where OpenStreetMap has no name in it. [Localization] place_name_language overrides it: "local" keeps the previous behavior, a language tag picks another language. Reverse-lookup cache keys include the language, so addresses cached in local languages are looked up again; "local" keeps the old keys.
