claude-code - 💡(How to fix) Fix [Bug] Claude Opus occasionally uses moskovian(russian) orthography instead of Ukrainian in system-prompted responses

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Bug Description ▎ Claude (Opus 4.7) when instructed to "respond in Ukrainian" via system prompt occasionally uses moskovian (russian) letters (e.g., "и" instead of "і") or russified word forms in Ukrainian responses. ▎ This is unacceptable for paying users. The model must use pure Ukrainian orthography (і, є, ї, ґ) consistently and avoid russisms entirely.

Environment Info

  • Platform: linux
  • Terminal: guake
  • Version: 2.1.150
  • Feedback ID: c829022a-34c4-4e90-8598-2e906ff14af2

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