Following are a number of back-translations as well as a sample translation for translators of Proverbs 15:1:

• Kupsabiny: “When/If one answers a word softly/slowly/humbly, it cools down the heart/temper of a person,
  but if/when one is being harsh it stirs/raises anger/strife.” (Source: Kupsabiny Back Translation)
• Newari: “A kindly answer placates wrath,
  but a harsh answer incites it.” (Source: Newari Back Translation)
• Hiligaynon: “A gentle/soft answer can-lighten/alleviate anger, but a harsh answer can-stir-up anger.” (Source: Hiligaynon Back Translation)
• Kankanaey: “The gentle/quiet answer, it extinguishes anger, but the hurtful word, it makes-it-worse.” (Source: Kankanaey Back Translation)
• English: “When people are angry with you, reply to them gently, and it will calm them;
  but if you reply harshly to them, it causes them to become more angry.” (Source: Translation for Translators)