Following are a number of back-translations as well as a sample translation for translators of Isaiah 21:10:

• Kupsabiny: “Please, you my people who have been threshed
  and sifted like wheat!
  I have told you what I have seen,
  the matters that the God of Israel who has authority has shown to me.” (Source: Kupsabiny Back Translation)
• Newari: “O my people, winnowed on the threshing floor!
  from the LORD Almighty, God of Israel
  what I have heard,
  that I will tell you.” (Source: Newari Back Translation)
• Hiligaynon: “Then I said, ‘My fellow Israelinhon, who were like treaded wheat, I am telling to you (plur.) the things which I have-heard from the LORD Almighty, the God of Israel.’” (Source: Hiligaynon Back Translation)
• English: “My people in Judah, the army of Babylon has caused you to suffer greatly
  as though you were grain that was threshed and winnowed/thrown up into the air for the wind to blow away the chaff.
  But now I have told you what the Commander of the armies of angels the God whom we Israelis worship, told me about Babylon.” (Source: Translation for Translators)