Following are a number of back-translations as well as a sample translation for translators of Lamentations 2:17:

• Kupsabiny: “God has fulfilled what he prepared
  the word that he said long ago has come to pass.
  He has overthrown you without mercy
  and allowed your enemies to rejoice over the victory,
  and he has exalted their power.” (Source: Kupsabiny Back Translation)
• Newari: “The LORD fulfilled what he had planned.
  What he had announced many years ago,
  and exactly that he has now brought about.
  He destroyed you without mercy.
  He made the enemy rejoice over you,
  he has increased the power of your enemies.” (Source: Newari Back Translation)
• Hiligaynon: “The LORD has done what he had planned to do. He really fulfilled what he said in-time-past. He destroyed you, without pity. He caused- your enemies-to-be-happy over your destruction and he allowed them to boast about their ability.” (Source: Hiligaynon Back Translation)
• English: “Yahweh has done what he planned;
  long ago he threatened to destroy you,
  and now he has done it.
  He has destroyed your city without acting mercifully toward you;
  he has enabled your enemies to he happy about defeating you;
  he has enabled your enemies to continually become stronger.” (Source: Translation for Translators)