Following are a number of back-translations as well as a sample translation for translators of Isaiah 9:17:

• Kupsabiny: “God will not have mercy on their young men,
  and he will not have mercy on the orphans or the widows.
  It is like that, because the whole community loved lies
  and all spread words/matters of sin.
  But his anger has not subsided,
  so he still wants to punish his people.” (Source: Kupsabiny Back Translation)
• Newari: “Therefore the LORD will not rejoice over their young people,
  nor will He have compassion on orphans or widows.
  For they are all evil ones who do not honor God.
  All that comes out of [their] mouths is evil.
  Still, his anger has not subsided,
  and his hand is still lifted.” (Source: Newari Back Translation)
• Hiligaynon: “Therefore the LORD will- not -be-glad in their young men, and he will- not -show-mercy to their fatherless and widows. For all are wicked and ungodly; what they speak are all/[lit. pure] shameful.
  But the anger of the LORD will- not -be-stopped still. He is still ready to punish them.” (Source: Hiligaynon Back Translation)
• English: “I, Yahweh, who am like a light for the people of Israel, will be the fire;
  I, the Holy One, will be like a flame.
  The soldiers of Assyria are like thorns and briers,
  and I will burn them up in one night.” (Source: Translation for Translators)