Following are a number of back-translations as well as a sample translation for translators of Jeremiah 30:15:

• Kupsabiny: “Why are you crying over your wounds
  that cannot be cured?
  I have done all these things to you
  because your mistake is big and your sins.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “Why do you complain that your sore does not get healed? I have done this to you (plur.) because your sins are great and very many.” (Source: Hiligaynon Back Translation)
• English: “Because that is true, why do you protest about my punishing you,
  as though I had caused a wound that could not be cured ?
  It was necessary for me to punish you,
  because you had committed many sins
  and you were very guilty.” (Source: Translation for Translators)