Following are a number of back-translations as well as a sample translation for translators of Isaiah 40:5:

• Kupsabiny: “Then, the greatness of God shall be seen/appear
  and all people shall suddenly see (it).
  It is God himself who is saying these words.’” (Source: Kupsabiny Back Translation)
• Newari: “Then the glory of the LORD will be seen,
  All the people of the world will see it together,
  for the mouth of the LORD has spoken like this."” (Source: Newari Back Translation)
• Hiligaynon: “Then the powerful presence of the LORD will-be-revealed, and this will-be-seen by all the people. This will- surely -happen, for the LORD himself has-said this.’” (Source: Hiligaynon Back Translation)