Following are a number of back-translations as well as a sample translation for translators of Jeremiah 9:1:

• Kupsabiny: “I wish that my head would become a well of water,
  and my eyes a spring of tears
  so that I could cry day and night
  for my people who have been killed!” (Source: Kupsabiny Back Translation)
• Hiligaynon: “Wish my eyes were spring of tears so-that I can-cry day-and-night because of my fellowmen who have-been-killed.” (Source: Hiligaynon Back Translation)