OsmTranslationProvider should validate name subkeys

[1ec5]

OsmTranslationProvider considers any key that begins with name: to be a name key. However, the OSM tagging convention is stricter: only valid IETF language tags (BCP 47) are considered to be translation subkeys. This includes subkeys such as name:en, name:sr-Latn, and name:zh-Hant-TW but excludes name:left, name:etymology:wikidata, name:en:pronunciation, and name:TEC (part of a distinct tagging scheme for station names that vary by transit operator).

planetiler/planetiler-core/src/main/java/com/onthegomap/planetiler/util/Translations.java

Line 151 in cbeba1b

if (key.startsWith("name:") && entry.getValue() instanceof String stringVal) {

#147 implemented a VALID_NAME_TAGS regular expression that should filter the name subkeys correctly.

[1ec5]

I assume the * wildcard in #1111 would be more usable once this filter is in place.