code: public <T> T getField(String locale, String key) {
      return localize(locale).getField(key);
    }
docs: Extracts a field from the fields set of the active locale, result type is inferred.
  
  @param locale locale to be used.
  @param key field key.
  @param <T> type.
  @return field value, null if it doesn't exist.