fix: show shared onlyoffice document in the recipient's language

[rezk2ll]

Problem

A recipient opening a shared OnlyOffice document (shared drive or cozy-to-cozy folder) saw the editor in the owner's language instead of their own. Opening a shared document redirects the viewer to the owner's public route, so the editor config is built on the owner's instance and the editor language (and the surrounding public page) come from the owner's instance locale. The recipient's own locale, known on their instance before the redirect, was never carried across.

Solution

Forward the viewer's locale through the redirect as a lang query param, then use it to set the OnlyOffice editor language and to resolve the public page locale (when it names a supported language). The editor language is not part of the signed editor token, so overriding it client side is safe. A reader now opens the document in their own language, while opening your own document keeps using your locale.

Summary by CodeRabbit

• New Features
  • Added language preference support via query parameter on public shared documents, enabling recipients to view shared content in their preferred language.
  • Improved locale consistency in the OnlyOffice viewer for shared document access.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 9d71ab5b-9d67-4488-b58f-6a0d9cca3953

📥 Commits

Reviewing files that changed from the base of the PR and between 1069a81 and bb0687d.

📒 Files selected for processing (3)

• src/modules/views/OnlyOffice/useConfig.jsx
• src/targets/public/localeHelper.js
• src/targets/public/localeHelper.spec.js

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Walkthrough

This PR adds locale (language) support for shared document viewing across two code paths. The public sharing page now resolves locale from a lang query parameter with highest precedence, falling back to browser locale or instance locale. The OnlyOffice editor integration retrieves the viewer's locale from useI18n and injects it into both the redirect parameters (for inter-instance sharing) and the editor configuration (to override backend locale for document recipients). Tests verify the query parameter precedence rules.

Possibly related PRs

• linagora/twake-drive#3872: Both PRs modify src/modules/views/OnlyOffice/useConfig.jsx to configure the OnlyOffice editor—this PR adds locale support while the referenced PR adjusts editor/mode configuration.

Suggested reviewers

• doubleface
• Crash--
• lethemanh
• JF-Cozy

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: enabling recipients to view shared OnlyOffice documents in their own language via a lang query parameter propagated through redirect.
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.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/onlyoffice-recipient-language

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[bundlemon]

BundleMon

Files updated (2)

Status	Path	Size	Limits
✅	public/static/js/public.(hash).js	150.65KB (+57B +0.04%)	-
✅	static/js/main.(hash).js	177.85KB (+17B +0.01%)	-

Unchanged files (19)

Status	Path	Size	Limits
✅	static/js/(chunkId).(hash).js	1.74MB	-
✅	public/static/js/(chunkId).(hash).js	1.4MB	-
✅	static/js/cozy.(hash).js	919.56KB	-
✅	public/static/js/cozy.(hash).js	779.75KB	-
✅	(hash).js	336.11KB	-
✅	public/(hash).js	336.11KB	-
✅	services/qualificationMigration.js	283.23KB	-
✅	services/dacc.js	262.97KB	-
✅	public/static/js/lib-react.(hash).js	43.88KB	-
✅	static/js/lib-react.(hash).js	43.88KB	-
✅	public/static/css/cozy.(hash).css	31.42KB	-
✅	static/css/cozy.(hash).css	31.42KB	-
✅	public/static/js/lib-router.(hash).js	21.86KB	-
✅	static/js/lib-router.(hash).js	21.86KB	-
✅	static/css/main.(hash).css	11.06KB	-
✅	public/static/css/public.(hash).css	6.76KB	-
✅	manifest.webapp	3.08KB	-
✅	index.html	715B	-
✅	assets/manifest.json	185B	-

Total files change +72B 0%

Groups updated (1)

Status	Path	Size	Limits
✅	**/*.js	12.6MB (+91B 0%)	-

Unchanged groups (2)

Status	Path	Size	Limits
✅	**/*.{png,svg,ico}	2.19MB	-
✅	**/*.css	163.42KB	-

Final result: ✅

View report in BundleMon website ➡️

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Current branch size history | Target branch size history