Following are a number of back-translations as well as a sample translation for translators of Isaiah 65:4:

• Kupsabiny: “They stay in the caves where people were buried,
  and are at night where no one knows.
  They eat the meat of pigs
  and drink the soup from impure things.” (Source: Kupsabiny Back Translation)
• Newari: “They sit in tombs
  and waiting in secret places they pass the night.
  They eat pig meat,
  and they made soup, having put repulsive things in a cup.” (Source: Newari Back Translation)
• Hiligaynon: “At night-time they sit on the graves and on the hidden places in-order to speak to the ghost of the dead-ones. They even eat the meat of the pig and some other food which are forbidden for them to eat.” (Source: Hiligaynon Back Translation)
• English: “They secretly remain awake at night in burial caves,
  talking with the spirits of dead people/their ancestors.
  They eat the meat of pigs,
  and their pots are full of other meat that is also unacceptable to me.” (Source: Translation for Translators)