Following are a number of back-translations as well as a sample translation for translators of Isaiah 40:3:

• Kupsabiny: “There is a mouth/voice which is shouting,
  Prepare for the lord a road/path in the wilderness.
  Broaden for our God a path
  in the wilderness.” (Source: Kupsabiny Back Translation)
• Newari: “A voice is heard, someone is crying out like this,
  "Make ready a way for the LORD in the desert,
  in the desolate places prepare a way for our God.” (Source: Newari Back Translation)
• Hiligaynon: “There is (someone-who)-is-preaching loudly. He says to the people, ‘You (plur.) prepare the way in the desolate-place for the LORD. Make-straight the way where our (incl.) God will-pass-by.” (Source: Hiligaynon Back Translation)