[Bug] Unexpected language switching to Portuguese regardless of configuration

Bug Description
Claude Code switches reply language mid-session despite CLAUDE.md forcing français, no user trigger.

Environment Info

• Platform: linux
• Terminal: pycharm
• Version: 2.1.231
• Feedback ID: 7d7b577b-2511-48c9-9a44-bbe07e186b2c

Hypothesis: repo's git history has a contributor whose name is from another language (surfaced via git log/blame during session) - possibly biased language selection, overriding configured language. Flagged by Claude itself mid-session after investigation.

Trying to get info/text for the issue from claude:

ouais pas nécessaire, et toi tu as des trucs à partager ?                                                                                                                                                                                        

● Version finale, sans repro:

  Bug: Claude Code switches reply language mid-session despite CLAUDE.md forcing français, no user trigger.

  Environment: linux, PyCharm terminal, v2.1.231, Feedback ID 7d7b577b-2511-48c9-9a44-bbe07e186b2c

  Hypothesis: repo's git history has a contributor whose name is from another language (surfaced via git log/blame during session) — possibly biased language selection, overriding configured language. Flagged by Claude itself mid-session after
  investigation.
  
  Detalhes extra que valem entrar, se quiser:
  - Aconteceu 2x na mesma sessão: uma vez dentro de texto de uma tool-call estruturada (AskUserQuestion, não resposta de chat normal), outra vez em texto de chat direto.
  - Uma sessão de plugin ativa (caveman, modo de resposta comprimida) rodava em paralelo — não sei se relevante, mas é diferença de ambiente vs sessão padrão.
  
  Mais nada a acrescentar além disso.