Following are a number of back-translations as well as a sample translation for translators of Jeremiah 51:58:

• Kupsabiny: “The wide wall of Babylon will be torn down and scattered
  and the tall gates shall be set on fire.
  Many people worked hard in vain to build (them)
  but their strength died in the fire.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “The LORD Almighty still said, ‘The thick walls of Babilonia will-be-demolished, and her high gates will-be-burned-up. Everything that her people has labored-for will-become worthless, for it will- just -burned-up.’” (Source: Hiligaynon Back Translation)
• English: “Yahweh also says,
  ‘The thick walls around Babylon will be flattened to the ground.
  The city gates will be burned.
  People from other countries will work hard to save the city,
  but it will be in vain/useless,
  because everything that they have built will be destroyed by fire.’” (Source: Translation for Translators)