Following are a number of back-translations as well as a sample translation for translators of Isaiah 30:7:

• Kupsabiny: “What Egypt can help those people with is useless.
  So, I gave Egypt the name
  to be called
  ‘Monster that can do nothing.’” (Source: Kupsabiny Back Translation)
• Newari: “The help from the land of Egypt has gone very much in vain.
  So I have called it ‘Rahab, the one who does nothing.’” (Source: Newari Back Translation)
• Hiligaynon: “This nation is Egipto, whose help has no value. Therefore I call it ‘Dragon that Lies-Down.’” (Source: Hiligaynon Back Translation)
• English: “The promises made by the king of Egypt are worthless;
  therefore I call Egypt ‘the sea monster/dragon that does nothing’.” (Source: Translation for Translators)