Following are a number of back-translations as well as a sample translation for translators of Isaiah 59:18:

• Kupsabiny: “He shall do to evil people according to their deeds.
  He is angry with those who oppose him and he punishes his enemies.
  He takes revenge on the lands that touch the ocean.” (Source: Kupsabiny Back Translation)
• Newari: “Like they have done, he will pay them back,
  with anger he will give punishment to those who do hostility
  and [he] will take revenge on the enemies.
  Like the ones of the lands of the islands have done to them, he will take revenge.” (Source: Newari Back Translation)
• Hiligaynon: “He will-take-revenge to his enemies according to their deeds; including those who are in the far places. They will- surely -experience his wrath.” (Source: Hiligaynon Back Translation)