(CODUX-226) Translate the File Browser

[numnx]

🧩 Task: Translate the File Browser

Automated task PR opened by Code UX for T22.

📋 Summary

Sprint: Sprint 226 · Dashboard internationalization foundation · Task: T22

Establish a dashboard-only English/German internationalization system with persisted locale selection, complete German coverage across every dashboard route and overlay except English documentation bodies, locale-aware formatting, and automated coverage checks while preserving backend contracts and runtime/API-authored messages verbatim.

🤖 Model & Provider

Provider	Codex CLI
Model	gpt-5.6-sol

⏱️ Timing

Started	2026-07-14 00:52:18 UTC
Finished	2026-07-14 00:58:28 UTC
Duration	6m 11s

📊 Token Usage

Metric	Value
Input tokens	340,617
Cached input tokens	9,546,496
Output tokens	35,214
Total tokens	9,922,327
Invocations	2
Tool calls	84
Active time	27m 15s

Included usage estimate (subscription/local login): $7.53

✅ QA Review

⏳ QA review runs after this PR is opened. Check the task card in the dashboard for the outcome once it lands.

📝 Full Task Prompt

## Objective
Translate all File Browser controls while preserving repository files, diffs, paths, syntax metadata, and backend errors verbatim.

## Scope
- Create `dashboard/src/v2/i18n/messages/file-browser.ts`
- Edit `dashboard/src/v2/FileBrowserPage.tsx`
- Edit all files under `dashboard/src/v2/components/file-browser/`
- Edit `dashboard/src/v2/hooks/use-file-browser-sessions.ts`
- Edit `dashboard/src/v2/lib/monaco-setup.ts` only for dashboard loading/accessibility copy
- Verify `dashboard/src/v2/lib/file-browser-api.ts` without translating response/error payloads
- Update File Browser page, tree, viewer, diff, changes, Monaco, accessibility, and E2E tests

## Implementation Requirements
1. Translate page headers, session selection/start controls, tree and changes labels, viewer/diff chrome, status badges, loading/empty/error states, retry actions, and accessible names.
2. Use locale-aware counts, dates, and change summaries while preserving Git status ordering and diff line calculations.
3. Keep paths, filenames, file contents, diff hunks, source language IDs, Git refs, sprint/project names, binary metadata, and server/API errors verbatim.
4. Test German session start/reuse, tree navigation, file and binary viewing, added/modified/deleted changes, diff loading, stale sessions, failures/retries, keyboard navigation, long paths, and mobile overflow containment.

## Constraints
- Do not translate repository content, generated diff text, code, path segments, or syntax identifiers.
- Do not change file-browser APIs, Monaco configuration, Git behavior, session lifecycle, or path-safety rules.
- Preserve selected file/change state across refreshes.

## Verification
- Run focused FileBrowserPage, file-browser component, and Monaco-related tests.
- Run `pnpm run lint`.
- Run `pnpm run test:dashboard`.
- Run `pnpm run build`.
- Success means File Browser chrome is German and repository/runtime data remains unchanged.

🌿 Branch Info

Base: feature/CODUX-226-dashboard-internationalization-foundation
Head: task/feature-codux-22-t22-codex-5db6a62d-mrjwi2kt

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🤖 Generated by Code UX