Following are a number of back-translations as well as a sample translation for translators of Zephaniah 2:9:

• Kupsabiny: “So, as I am the God of Israel, Moab will be destroyed like Sodom and also Ammon will be destroyed like Gomorrah. The land of those people will become a bush and holes with/of salt and always be deserted. My people who are left will attack those people plundering their things and take their country.’” (Source: Kupsabiny Back Translation)
• Newari: “Therefore, as surely as I am living one"
  declares the LORD Almighty, the God of Israel,
  "surely Moab and Ammonites will became like Sodom and Gomorrah removed.
  A place of weeds and salt pits, a barren land for ever and ever.
  The remnant of my people will plunder them,
  and will possess their land.’” (Source: Newari Back Translation)
• Hiligaynon: “The LORD Almighty, the God of Israel said, ‘I heard the putting-to-shame and mocking of those- (who) -come-from-Moab and those- (who) -from-Ammon of my people. They also boast that they are-able to take-by-force the land of my people. Therefore I swear to myself that I will- surely -destroy Moab like Sodom and Ammon like Gomora. These lands can- no-longer -be-useful forever/[lit. until whenever]. This will- now -be-covered with thorny grass and be-filled with holes where salt is being-made. This will-be-taken-by-force by my remaining people and they will-take its properties.’” (Source: Hiligaynon Back Translation)
• English: “So now, as surely as I live, I will destroy Moab and Ammon
  like I destroyed Gomorrah city.
  Their land will be a place where there are nettles and salt pits;
  it will be ruined forever.
  My Israeli people who survive will take away all their valuable possessions
  and also occupy their land.’” (Source: Translation for Translators)