chore: update backend comments to proper French

[MEHDImp4]

Updates the comments in the backend files to use proper French with correct accents and grammar to ensure they look professional and simple to understand for French speakers.

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PR created automatically by Jules for task 10921932713318947144 started by @MEHDImp4

[google-labs-jules]

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[MEHDImp4]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Conflits résolus et PR mise à jour dans le commit 7645d2e. J’ai fusionné origin/master, conservé les changements fonctionnels de accounts/views.py et supprimé les marqueurs de conflit. Aucun changement UI dans cette résolution.