feat(i18n): Add French language support.

[comeback01]

This pull request introduces complete French language support to the application.

Key Changes:

 New Translation:* Added a full fr.json translation file for the user interface, based on the existing en.json file.
 UI Integration:*
  *   Updated the i18n configuration to recognize and load the French locale.
  *   Modified the language selector in the header to include "Français" as an option, complete with its flag.
 Documentation:*
  *   Included a fully translated French README.fr.md.
  *   Updated the main README.md and README.en.md files to link to the new French documentation.
 Verification:* Added an automated Playwright script to verify that the language can be successfully switched to French.

This branch has been updated with the latest changes from the main branch to ensure there are no conflicts. The previous pull request can be closed.

Summary by CodeRabbit

• New Features

  • Added French (Français) as a selectable language in the UI, including flag and active-state in the language selector.
  • Enabled French translations by integrating fr locale into i18n resources.
  • Introduced a shared “Change Language” string under a common namespace for en/zh.

• Documentation

  • Added a full French README (README.fr.md).
  • Updated README language links to include Français across English and Chinese versions.

[coderabbitai]

Important

Review skipped

Review was skipped as selected files did not have any reviewable changes.

💤 Files selected but had no reviewable changes (1)

• web/src/i18n/locales/fr.json

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Walkthrough

Adds French language support across the app: new French README, updated README language links, LanguageSelector now includes Français, i18n wired with fr resources, and new "common.changeLanguage" key added to en/zh locale files.

Changes

Cohort / File(s)	Summary
Documentation README.md, README.en.md, README.fr.md	Added Français link to language switch in README files; introduced full French README translation.
UI Language Selector web/src/components/layout/headerbar/LanguageSelector.jsx	Added Français option with FR flag; updated button label to use t('common.changeLanguage'); mirrors zh/en behavior.
i18n Setup web/src/i18n/i18n.js	Imported and registered fr locale into i18n resources alongside en and zh.
Locale Files web/src/i18n/locales/en.json, web/src/i18n/locales/zh.json, web/src/i18n/locales/fr.json	Added top-level common.changeLanguage key to en and zh; introduced fr translations file and resource.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  participant U as User
  participant LS as LanguageSelector
  participant I18N as i18n (en/zh/fr)
  participant UI as App UI

  U->>LS: Click language menu
  LS->>I18N: onLanguageChange('fr')
  I18N->>I18N: Set current locale = fr
  I18N-->>UI: Provide fr resources
  UI-->>U: Re-render with French strings
  note right of UI: Uses common.changeLanguage key

Loading

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

A hop, a skip, a “bonjour!” cheer,
I twitch my ears—Français is here! 🐇
Flags unfurl, three tongues in tow,
Click and—voilà!—the words all flow.
In docs and menus, c’est parfait—
I nibble bugs and bound away.

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The provided title “feat(i18n): Add French language support” concisely and accurately reflects the main objective of the changeset, which is to introduce French localization across UI, documentation, and configuration for the application. It uses clear, conventional commit styling, highlights the primary feature area (i18n), and avoids extraneous details, making it easy for teammates to understand the pull request’s intent at a glance.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 143a2de and 72177c2.

⛔ Files ignored due to path filters (2)

• bun_output.log is excluded by !**/*.log
• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (8)

• README.en.md (1 hunks)
• README.fr.md (1 hunks)
• README.md (1 hunks)
• jules-scratch/verification/verify_translation.py (1 hunks)
• web/src/components/layout/headerbar/LanguageSelector.jsx (2 hunks)
• web/src/i18n/i18n.js (2 hunks)
• web/src/i18n/locales/en.json (1 hunks)
• web/src/i18n/locales/zh.json (1 hunks)

🧰 Additional context used

🧬 Code graph analysis (1)

web/src/components/layout/headerbar/LanguageSelector.jsx (1)

web/src/hooks/common/useHeaderBar.js (1)

• currentLang (39-39)

[comeback01]

Hi, I've just updated this branch with the latest changes from main. It should now be up-to-date and ready for review. Thanks!

[Calcium-Ion]

jules-scratch/verification/verify_translation.py
this verification script should we remove this directory before merging?

[comeback01]

jules-scratch/verification/verify_translation.py this verification script should we remove this directory before merging?

Hi @Calcium-Ion,

Thanks for the suggestion.

I've removed the jules-scratch verification directory as you recommended.

Additionally, I have updated this branch with the latest changes from main and added the missing French translation for the new keys that were included in the update.

The pull request should now be up-to-date and ready for another review.

Thanks

[Calcium-Ion]

Can this verification script be deleted?

[Calcium-Ion]

This file is redundant.