Following are a number of back-translations as well as a sample translation for translators of Proverbs 13:12:

• Kupsabiny: “When what a person wants/needs is delayed, he loses heart/hope,
  but when he receives that thing, he becomes happy.” (Source: Kupsabiny Back Translation)
• Newari: “When one does not get what one longs for
  it tends to be like dying.
  As for obtaining what one longs for,
  it is like a tree of life.” (Source: Newari Back Translation)
• Hiligaynon: “The desire of a man which have- not -been-fulfilled causes- him -to-become-weak, but his desire which have-been-fulfilled strengthens and gives-joy to his life.” (Source: Hiligaynon Back Translation)
• Kankanaey: “If hope/expectation is not fulfilled for a long-time, (one’s) thoughts/feelings are injured, but if (one’s) wishes are fulfilled, it is like a tree that gives life.” (Source: Kankanaey Back Translation)
• English: “When people do not receive the things that they are expecting to receive, it causes them to despair/they become very sad;
  but if you receive what you are desiring to get, that will be like a tree whose fruit gives you life (OR, that will cause you to be joyful).” (Source: Translation for Translators)