(CODUX-226) Translate sprint authoring and Quicksprints

[numnx]

🧩 Task: Translate sprint authoring and Quicksprints

Automated task PR opened by Code UX for T12.

📋 Summary

Sprint: Sprint 226 · Dashboard internationalization foundation · Task: T12

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 03:05:51 UTC
Finished	2026-07-14 03:13:41 UTC
Duration	7m 50s

📊 Token Usage

Metric	Value
Input tokens	761,307
Cached input tokens	42,750,720
Output tokens	102,867
Total tokens	43,614,894
Invocations	4
Tool calls	295
Active time	1h 8m 4s

Included usage estimate (subscription/local login): $28.27

✅ 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 every sprint-authoring and Quicksprint workflow without changing generated prompts, Markdown, settings overrides, or planning requests.

## Scope
- Create `dashboard/src/v2/i18n/messages/sprint-authoring.ts`
- Edit all files under `dashboard/src/v2/components/quicksprint/`
- Edit `dashboard/src/v2/components/ui/AddSprintModal.tsx`, `AddTaskModal.tsx`, `SprintComposer.tsx`, `SprintMarkdownModal.tsx`, `SprintSettingsOverrideModal.tsx`, `PlanningProgressOverlay.tsx`, and `PlanningShip.tsx`
- Edit `dashboard/src/v2/components/settings/ProjectSettingsEditor.tsx`
- Edit presentation helpers `sprint-composer-state.ts`, `task-composer-state.ts`, `sprint-planning-feedback.ts`, `quicksprint-panel-state.ts`, and `project-worker-options.ts`
- Update SprintComposer, Quicksprint, planning overlay, Markdown transfer, and settings-override tests

## Implementation Requirements
1. Translate form labels, action modes, validation, provider/agent selectors, planning progress, template browsing/editing, execution states, Markdown import/export chrome, settings override labels, and accessible announcements.
2. Preserve sprint goals, task prompts, Markdown text, generated execution plans, provider/model IDs, agent names, settings keys/values, schedule targets, and server responses verbatim.
3. Keep improve/plan/start/cancel/retry behavior, duplicate-submit prevention, draft recovery, unsaved-change confirmation, focus handling, and planning timeout/error paths unchanged.
4. Test German validation, plan-only and plan-and-start flows, provider failures, cancellation, template execution, Markdown round-trip, override save/reset, and responsive keyboard operation.

## Constraints
- Do not translate or rewrite text submitted to planning or coding agents.
- Do not change API request shapes, persisted templates, settings schemas, scheduling behavior, or orchestration semantics.
- Do not edit Sprints page/ledger files owned by T11.

## Verification
- Run focused SprintComposer, Quicksprint, sprint draft, planning feedback, Markdown, and override tests.
- Run `pnpm run lint`.
- Run `pnpm run test:dashboard`.
- Run `pnpm run build`.
- Success means authoring controls are German while generated and user-authored sprint/task content round-trips unchanged.

🌿 Branch Info

Base: feature/CODUX-226-dashboard-internationalization-foundation
Head: task/feature-codux-22-t12-codex-72fde982-mrjwhi5w

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🤖 Generated by Code UX