Update LanguagesExploration.scala
Update LanguagesExploration.scala

Adding number 21 and comments for most (if not all) subsections in the code.
pascalalfadian/LanguagesExploration,kuzan754/LanguagesExploration,pascalalfadian/LanguagesExploration,MelindaNurAbianti/LanguagesExploration,pascalalfadian/LanguagesExploration,pascalalfadian/LanguagesExploration,MelindaNurAbianti/LanguagesExploration,pascalalfadian/LanguagesExploration,pascalalfadian/LanguagesExploration