Following are a number of back-translations as well as a sample translation for translators of Jeremiah 23:20:

• Kupsabiny: “God will not swallow his anger any more
  until it has been fulfilled what he wants to do.
  You will know/understand these words well in the end/later.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “My anger will- not surely -vanish until I can do what I want to do. And in the future days, you (plur.) will-understand this well.” (Source: Hiligaynon Back Translation)
• English: “I will not stop being angry
  until I completely accomplish all that I have planned.
  In the future, you will understand all of this clearly.’” (Source: Translation for Translators)