Following are a number of back-translations as well as a sample translation for translators of Jeremiah 4:8:

• Kupsabiny: “So, put on sacks
  and cry while mourning
  because God will destroy the people of Judah
  in his fierce anger.’” (Source: Kupsabiny Back Translation)
• Hiligaynon: “Therefore you (plur.) clothed (yourselves) with sackcloth to show your (plur.) mourning. You (plur.) weep for the fierce anger of the LORD is still upon us (excl.).” (Source: Hiligaynon Back Translation)
• English: “So, put on sackcloth/rough clothes
  and weep and beat your chests
  to show that you are very sorry for what you have done,
  because Yahweh is still very angry with us.” (Source: Translation for Translators)