Following are a number of back-translations as well as a sample translation for translators of Isaiah 41:15:

• Kupsabiny: “I shall make you to be a piece of wood that one threshes with,
  which is still new and has sharp pegs.
  You shall thresh mountains and crush them.
  You shall make the hills become chaff.” (Source: Kupsabiny Back Translation)
• Newari: “Look, I will make you to be
  a threshing board with new and pointed nail.
  You will peal the mountains
  and beat them to Chaff.” (Source: Newari Back Translation)
• Hiligaynon: “Listen! I will-make you (sing.) like a new equipment to be-used-to-thresh and has sharp and many teeth. You (sing.) will-thresh and smash the mountains and make (them) as-if-like chaff.” (Source: Hiligaynon Back Translation)