docs: public static Map<String, String> getSpoilers(Message message) {
          if (!containsSpoiler(message)) {
              return Collections.emptyMap();
          }
  
          List<ExtensionElement> spoilers = message.getExtensions(SpoilerElement.ELEMENT, NAMESPACE);
          Map<String, String> map = new HashMap<>();
  
          for (ExtensionElement e : spoilers) {
              SpoilerElement s = (SpoilerElement) e;
              if (s.getLanguage() == null || s.getLanguage().equals("")) {
                  map.put("", s.getHint());
              } else {
                  map.put(s.getLanguage(), s.getHint());
              }
          }
  
          return map;
      }