Following are a number of back-translations as well as a sample translation for translators of Isaiah 65:23:

• Kupsabiny: “They shall not do work that they struggle for in vain
  nor shall their children meet with any calamity.
  I God shall bless those children
  and all their grandchildren.” (Source: Kupsabiny Back Translation)
• Newari: “They will not do work in vain,
  or give birth to children for misfortune.
  For they, along with their descendants,
  will be a people blessed by me, the LORD.” (Source: Newari Back Translation)
• Hiligaynon: “They will- not -labor for nothing, or give-birth to a child who will be unlucky later. For they are the people and their descendants whom I blessed.” (Source: Hiligaynon Back Translation)