Following are a number of back-translations as well as a sample translation for translators of Proverbs 29:12:

• Kupsabiny: “If a king believes the words of a liar,
  his people/workers will be liars.” (Source: Kupsabiny Back Translation)
• Newari: “If the ruler listens to lies,
  all his people will become liars.” (Source: Newari Back Translation)
• Hiligaynon: “If a leader believes in lies, all his officials will-become wicked.” (Source: Hiligaynon Back Translation)
• Kankanaey: “The ruler who believes what is not true will-come-to-have bad officials.” (Source: Kankanaey Back Translation)
• English: “If a ruler pays attention to/believes people who tell lies,
  all his officials will also become wicked.” (Source: Translation for Translators)