Following are a number of back-translations as well as a sample translation for translators of Isaiah 12:4:

• Kupsabiny: “In those days, you (plur.) shall sing,
  ‘Thank (you plur.) God, please!
  Exalt (plur.) his name.
  Show (plur.) to all nations what he did for us
  show the greatness that he has!” (Source: Kupsabiny Back Translation)
• Newari: “On that day you will sing a song like this —
  "Give thanks to the LORD! proclaim his name.
  Proclaim to the nations all the work he has done.
  Tell them all how great he is!” (Source: Newari Back Translation)
• Hiligaynon: “When that day will-arrive, you (plur.) will-sing:
  ‘[You (plur.)] praise the LORD!
  [You (plur.)] worship him!
  Tell to the people his acts/deeds.
  [You (plur.) tell (others) that he is worthy-of-praise.” (Source: Hiligaynon Back Translation)
• English: “At that time you all will say,
  ‘We should thank Yahweh! We should praise him !
  We should tell the people of all the people-groups what he has done;
  we should enable them to know that he is very great!” (Source: Translation for Translators)