Following are a number of back-translations as well as a sample translation for translators of Jeremiah 50:23:

• Kupsabiny: “The land of Babylon used to smash people with a hammer
  but now, the thing they used to smash others with has been broken to pieces.
  Look, how much Babylon has been subdued,
  when one looks at/compares with other communities
  over what has come to them,” (Source: Kupsabiny Back Translation)
• Hiligaynon: “Babilonia is like a hammer that shattered the nations, but now it was smashed already. The nations were- very -astonished/stunned when they saw the destruction of Babilonia!” (Source: Hiligaynon Back Translation)