Following are a number of back-translations as well as a sample translation for translators of Isaiah 6:3:

• Kupsabiny: “Those angels called out to one another,
  ‘Holy, holy
  holy is the God of power!
  His greatness fills the whole world/land.’” (Source: Kupsabiny Back Translation)
• Newari: “And [they] were crying out to one another like this,
  "Holy, holy, holy is the LORD,
  the greatest of all,
  The whole earth is
  being filled with His glory."” (Source: Newari Back Translation)
• Hiligaynon: “They said to one another:
  ‘Holy, holy, holy is the LORD Almighty! His powerful presence engulfs the whole world.’” (Source: Hiligaynon Back Translation)
• English: “They were calling to each other, saying,
  ‘The Commander of the armies of angels is holy;
  he is completely holy!
  The entire earth is filled with his glory.’” (Source: Translation for Translators)