Following are a number of back-translations as well as a sample translation for translators of Isaiah 14:15:

• Kupsabiny: “But you were pulled down to the realm of the dead,
  you were made to go down to inside the world of the dead.” (Source: Kupsabiny Back Translation)
• Newari: “But you have fallen, being caused to lie down in the grave,
  in the lowest of all nether worlds.” (Source: Newari Back Translation)
• Hiligaynon: “‘But what will-happen to you (sing.), you (sing.) will-be-brought to the place of the dead-ones, to the depths of the pit.” (Source: Hiligaynon Back Translation)
• English: “But you were not able to do that;
  instead, you were carried down to your grave,
  and you went to the place where the dead people are.” (Source: Translation for Translators)