Following are a number of back-translations as well as a sample translation for translators of Numbers 21:27:

• Kupsabiny: “That is what made the people of proverbs say,
  Come (plur.) to Heshbon, the city of Sihon.
  Let this city be built.” (Source: Kupsabiny Back Translation)
• Newari: “Since it is like that, the poets speak like this,
  "Come to Heshbon, and may it be rebuilt!
  May the city of Sihon be nicely rebuilt.” (Source: Newari Back Translation)
• Hiligaynon: “That (is) why the poets says,
  ‘[You (plur.)] come to Heshbon, the city of Sihon, and [you (plur.)] build it again. Formerly the soldiers of Heshbon attacked like a blazing fire and devoured the town of Ar which is under-the-jurisdiction of Moab and destroyed the high places of Arnon.” (Source: Hiligaynon Back Translation)
• English: “For that reason, one of the poets wrote long ago,
  ‘Come to Heshbon, the city where King Sihon ruled.
  We want the city to be restored/rebuilt.” (Source: Translation for Translators)