Should Jews speak Yiddish?

[ItalianZionist]

Some Jews say it's a " holy language ". How can it be? It's like 70 to 80% German. I even understand it with the little German I know. I believe Chaim would say it's better not to speak the language of your enemies and speak Hebrew instead.

[Hrvatski Noahid]

Torah texts are canonized in Hebrew and Aramaic.

[Nachus]

                                                                                                                          

  The Yiddish language was the one ‘mainly’
  spoken in the diaspora by the Jewish people
  in Europe and there are Jews that still use
  some of the expressions of Yiddish as well
  as speak it however, the official language of Jews
  is that of Israel, the Hebrew language and the one 
  that should be be spoken.
 

[Nachus]

                                                                                                                          

  One of the languages and a language that
  some the Jewish people still speak and or
  at least understand is Ladino.