Following are a number of back-translations as well as a sample translation for translators of Jeremiah 9:24:

• Kupsabiny: “The person who wants to boast,
  let (him) boast that he knows me and follows my will,
  that he trusts in me,
  that I stand on truth
  that I am righteous in everything that I do in the land/world.
  It is people like those who make me happy.
  It is me God who has spoken.’” (Source: Kupsabiny Back Translation)
• Hiligaynon: “If he/she wants to boast, he/she should only boasts that he/she understood and have-known me, that I am the loving LORD, who does right and righteous/just here on earth, for this is my joy. I, the LORD, (am) the-(one) saying this.’” (Source: Hiligaynon Back Translation)
• English: “Instead, those who want to boast should boast about their knowing me
  and about understanding that I am Yahweh,
  that I am kind and just and righteous,
  that I faithfully love people,
  and that I am delighted with people who act that way.” (Source: Translation for Translators)