Following are a number of back-translations as well as a sample translation for translators of Isaiah 38:20:

• Kupsabiny: “God saves people,
  let us play the lyres.
  Let us sing in his house
  all the days that were are still alive.” (Source: Kupsabiny Back Translation)
• Newari: “The LORD will save me.
  and for our whole lifetime
  in the temple of the LORD
  playing a stringed instrument, I will sing.” (Source: Newari Back Translation)
• Hiligaynon: “LORD, you (sing.) are my savior, therefore in our (incl.) whole life, we (incl.) will-sing in your (sing.) temple playing with instruments.” (Source: Hiligaynon Back Translation)
• English: “I know that Yahweh will fully heal me,
  so I will sing to praise him
  while others praise him playing musical instruments;
  I will do that every day of my life, in the temple of Yahweh.’” (Source: Translation for Translators)