private void addExtraNameTags(Map<String, Object> output, Map<String, Object> input) {
    if (!extraNameTags.isEmpty()) {
      Map<String,Object> extraTags =  extraNameTags.stream()
        .filter(input::containsKey)
        .filter(tag -> input.get(tag) != null && !input.get(tag).equals(""))
        .collect(Collectors.toMap(t -> t, input::get));
      if (!extraTags.isEmpty()) {
        output.putAll(extraTags);
      }
    }
  }
Set a list of extra name tags to be copied from the OSM source to the output result
@param extraNameTags: List of extra name tags to copy to translation outputs.
@return this
planetiler-core/src/main/java/com/onthegomap/planetiler/util/Translations.java