Following are a number of back-translations as well as a sample translation for translators of Isaiah 40:2:

• Kupsabiny: “So speak slowly (comfort) the people of Jerusalem,
  tell them that their troubles are over.
  Their sins have been forgiven.
  God has punished those people enough
  for their rebellion.’” (Source: Kupsabiny Back Translation)
• Newari: “Give courage to the people of Jerusalem.
  Say to them,
  They have been having trouble eating for a long time.
  Now their sin has been forgiven,
  For their sin
  I have given them full punishment.” (Source: Newari Back Translation)
• Hiligaynon: “You (plur.) speak gently to the people of Jerusalem. Tell-the-news to them that their suffering is/are now over/finish, and their sins have-been-now -forgiven. For I have-punished them so much of all their sins.’” (Source: Hiligaynon Back Translation)