fix(i18n): correct French translations - completed_on, stickies, backlog, and other untranslated strings

[Lib-LOCALE]

Summary

This PR fixes several French translations that were still in English in the @plane/i18n package.

Changes

File	Change
common.json	"Completed on" -> "Terminé le", "Your profile" -> "Votre profil", "Developer" -> "Développeur", "Work structure" -> "Structure de travail", "Execution" -> "Exécution"
navigation.json	"Stickies" -> "Notes"
inbox.json	"in-app" -> "dans l'application"
work-item.json	"Backlog" -> "En attente"
workspace.json	"Backlog" -> "En attente"
project.json	"Backlog" -> "En attente"
integration.json	"Client Secret" -> "Secret client", "Webhook Secret" -> "Secret webhook"

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change
• Documentation update
• Translation improvement

Test Scenarios

• All 28 FR JSON files validated for syntax
• All keys match between EN and FR files
• Remaining values that match EN are either brand names (GitHub, Slack, Plane), placeholder examples (URLs, cron expressions), or words identical in French (Info, Cycle, Module, Page, etc.)

[CLAassistant]

All committers have signed the CLA.

[coderabbitai]

📝 Walkthrough

Walkthrough

Twelve English-valued strings in French locale files are replaced with proper French translations. Affected keys span backlog states (3 files), completed_on, four profile/settings labels, the inbox in-app source label, the sidebar stickies navigation label, and GitLab Enterprise integration field labels.

Changes

French Locale String Corrections

Layer / File(s)	Summary
Replace English placeholders with French translations packages/i18n/src/locales/fr/common.json, packages/i18n/src/locales/fr/project.json, packages/i18n/src/locales/fr/work-item.json, packages/i18n/src/locales/fr/workspace.json, packages/i18n/src/locales/fr/inbox.json, packages/i18n/src/locales/fr/navigation.json, packages/i18n/src/locales/fr/integration.json	backlog → "En attente" in project, work-item, and workspace files; completed_on → "Terminé le" and four settings labels (your_profile, developer, work_structure, execution) localized in common; in-app → "dans l'application" in inbox; Stickies → "Notes" in navigation; GitLab Enterprise client secret and webhook secret field titles translated to French.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐇 Hop hop, no more English in sight,
The French strings are finally right!
"En attente" for backlog, c'est vrai,
"Terminé le"—magnifique, I say!
Notes, profils, secrets all in place—
La traduction wins the race! 🇫🇷

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: correcting French translations for multiple untranslated or partially translated strings across various locale files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The PR description comprehensively covers all changes with a clear summary, detailed change table, properly selected type of change, and thorough test scenarios.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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