Following are a number of back-translations as well as a sample translation for translators of Lamentations 2:18:

• Kupsabiny: “People shout loudly
  crying out to God.
  Oh, city of Zion,
  cry day and night
  without getting tired or closing the eyes,
  until the tears flow like water from a river.” (Source: Kupsabiny Back Translation)
• Newari: “The hearts of the people
  cry to the Lord for help.
  O wall of the daughter Zion!
  Let your tears flow like a river, day and night.
  Don’t take rest, not even a short bit
  Don’t give your eyes any rest.” (Source: Newari Back Translation)
• Hiligaynon: “Residents of Zion, you call upon the Lord. Let your tears flow like the river that flows day-and-night. You don’t crying.” (Source: Hiligaynon Back Translation)
• English: “I wish/desire that the walls of Jerusalem
  would cry out to Yahweh!
  You people of Jerusalem ,
  Cry day and night!
  Let your tears flow like rivers.
  Do not stop grieving;
  do not stop crying.” (Source: Translation for Translators)