code: static void registerInstance(Transliterator trans, boolean visible) {
          registry.put(trans.getID(), trans, visible);
      }
docs: Register a Transliterator object.
  
  <p>Because ICU may choose to cache Transliterator objects internally, this must
  be called at application startup, prior to any calls to
  Transliterator.getInstance to avoid undefined behavior.
  
  @param trans the Transliterator object