Following are a number of back-translations as well as a sample translation for translators of Proverbs 21:23:

• Kupsabiny: “A person who guards his mouth (words),
  guards himself against trouble/turmoil.” (Source: Kupsabiny Back Translation)
• Newari: “The one who is able to control
  his own mouth and tongue
  will deliver himself from trouble.” (Source: Newari Back Translation)
• Hiligaynon: “A man who guards what he says can-avoid trouble.” (Source: Hiligaynon Back Translation)
• Kankanaey: “One who is circumspect/cautious with his words will avoid problems.” (Source: Kankanaey Back Translation)
• English: “Those who are very careful about what they say
  are able to avoid trouble.” (Source: Translation for Translators)