Following are a number of back-translations as well as a sample translation for translators of Proverbs 29:18:

• Kupsabiny: “Where there is no revelation from God, people go astray/get mixed up,
  but a person who keeps the laws of God is happy.” (Source: Kupsabiny Back Translation)
• Newari: “People who do not follow the way of God’s guidance
  will become unrestrained / uninhibited.
  Those who obey God’s law will be blessed.” (Source: Newari Back Translation)
• Hiligaynon: “If there is no message of God that will-guide a people-group, it does-whatever-it-wants. Blessed are the people who obey what God teaches.” (Source: Hiligaynon Back Translation)
• Kankanaey: “If it is not God who directs the mind of people, they will forget the law. Blessed is the one who obeys his law.” (Source: Kankanaey Back Translation)
• English: “When the people of a nation do not receive messages that come directly from God, they do not control their behavior.
  God is pleased with those who obey his laws.” (Source: Translation for Translators)