Following are a number of back-translations as well as a sample translation for translators of Isaiah 42:4:

• Kupsabiny: “He shall never lose hope or give up,
  until truth/justice has won in the whole world.
  The lands that touches the sea/ocean are waiting/hoping
  wanting his teaching.’” (Source: Kupsabiny Back Translation)
• Newari: “As long as justice has not been established [on] earth
  he will not be weak or even become frustrated.
  Those who live in distant lands will put their hope in his teaching."” (Source: Newari Back Translation)
• Hiligaynon: “He will- never -grow-weak or lost hope until he let- justice -be-established in the world. Even the people in the far places will-hope on his teaching.’” (Source: Hiligaynon Back Translation)