code: @Override
      public String name() {
  
          StringBuilder sb = new StringBuilder();
          sb.append(this.romaji);
          sb.append(" (");
          Optional<Nengo> next = this.findNext();
          if (next.isPresent()) {
              sb.append(this.relgregyear);
              sb.append('-');
              sb.append(next.get().relgregyear);
          } else {
              sb.append("since ");
              sb.append(this.relgregyear);
          }
          sb.append(')');
          return sb.toString();
  
      }
docs: /*[deutsch]
  <p>Liefert einen Beschreibungstext mit romaji-Umschreibung und dem relevanten Jahrintervall. </p>
  
  @return  String