Following are a number of back-translations as well as a sample translation for translators of Deuteronomy 32:27:

• Kupsabiny: “If it was not for the arrogance/gloating of their enemies
  I would have destroyed them.
  I did not want their enemies to think
  that they were the ones who were victorious
  and not me God.’” (Source: Kupsabiny Back Translation)
• Newari: “But I did not want their enemies to mock them.
  I did not want their opponents to understand wrongly,
  saying- ‘We, with our own strength have conquered them,
  it is not the LORD who has done it.’"” (Source: Newari Back Translation)
• Hiligaynon: “But I will- not -allow their enemies to boast and will-say, ‘We (incl.) have-defeated them. The LORD did- not -do this.’ ’” (Source: Hiligaynon Back Translation)
• English: “But if I did that, their enemies would wrongly boast
  that they were the ones who had gotten rid of my people;
  they would say, ‘We are the ones who defeated them;
  it was not Yahweh who has done all these things.’’” (Source: Translation for Translators)