Following are a number of back-translations as well as a sample translation for translators of Isaiah 45:20:

• Kupsabiny: “Gather yourselves and come
  oh, you people who remain in other countries.
  Those people who carry around idols know nothing
  and they bow to idols that cannot save people.” (Source: Kupsabiny Back Translation)
• Newari: “All of you come to gather in one place,
  All you refugees from the nations,
  come before me,
  [you] who go carrying loads of wooden idols,
  and who pray to gods who are not able to save,
  who know nothing at all. ” (Source: Newari Back Translation)
• Hiligaynon: “The LORD still said, ‘You (plur.) gather together and come-near to me, you (plur.) who were-able-to-flee from the nations. The ones-who-carry their wooden little-gods/false-gods do not know (anything) at-all. They pray to these little-gods/false-gods that can- not- save them.” (Source: Hiligaynon Back Translation)