Following are a number of back-translations as well as a sample translation for translators of Isaiah 42:25:

• Kupsabiny: “So/therefore God became very angry with the people of Israel
  and pushed (them) into war.
  (He) pained/punished those people from/at all sides
  and they did not realize/understand.
  Those people got destroyed
  but did not take those words to heart/head.” (Source: Kupsabiny Back Translation)
• Newari: “So he has poured out his anger on them,
  and allowed [them] the trouble [and] sorrow of being killed by doing battle
  His anger has burned like fire in all Israel.
  But they never understood what was happening,
  from that they have not learned anything.” (Source: Newari Back Translation)
• Hiligaynon: “Therefore the LORD shown his fierce anger to us (incl.) by-means of our (incl.) suffering in the war. His anger is like a fire which engulfed and burned us (incl.), but we (incl.) did- not -think about it and pay-(any)-attention.” (Source: Hiligaynon Back Translation)