#15 i18n S6 — localize sprints slice (sprints ns, DE/EN)

[WolfTasks]

Summary

Session 6 of the #15 i18n full rollout: localizes the sprint slice — SprintsPage, SprintCard, SprintHeader, CreateSprintForm, CompleteSprintDialog — into a new sprints namespace (en/de). This slice also cleans up the pre-existing mixed DE/EN hardcoded strings.

• New sprints namespace (nested section/empty/form/complete keys) registered in i18n/index.ts, en/de key-identical (parity-checked)
• Replaced hardcoded German section titles (Laufend/Geplant/Abgeschlossen, passed as scanner-blind renderSection args) and empty hints with t()
• i18next plural keys for counts: daysRemaining_one/_other, complete.warning_one/_other — no fragment concatenation, no day{s}/issue{s} ternary hacks
• CompleteSprintDialog bold-count warning uses a single <Trans> element mapping <0>…</0> → yellow <span> (markup + plural without glued fragments)
• SprintCard date range now via format.ts formatDate (locale-aware) instead of raw toLocaleDateString; – en-dash and / stay literal glyphs
• Shared completeSprint key reused by header button + dialog confirm; common:loading/common:cancel reused
• Generated default sprint name (useState(\Sprint ${Date.now()}`…)`) left out of scope
• All 5 files removed from frontend/scripts/i18n-allowlist.json (50 → 45)
• S6 coverage-matrix row flipped to ✅

Verification

Full slice gate green: scanner self-tests 17/17, i18n-scan: OK — 0 hardcoded strings (45 allowlisted), i18n-parity: OK, tsc && vite build successful. Whole-branch review (opus) merge-ready, 0 Critical/Important; one Minor German closing-quote typo (”→“) found in review and fixed in this branch.

Owed: Wolfgang's manual DE/EN browser check — Sprints page (title, section headings, empty hints), sprint cards (points line + date range), board sprint header (Complete Sprint, 1-day singular, points), create-sprint form (labels/Create/Cancel), complete-sprint dialog (title, yellow bold-count warning singular/plural + all-done, Cancel, Complete/Completing).

🤖 Generated with Claude Code