docs(34-08): complete German translation gap closure plan summary

- 58 missing German keys added across 5 de/*.json files
- 19/19 i18n parity tests pass
- 1 deviation: fixed JSON syntax error from smart quotes

.planning/phases/34-i18n-foundation/34-08-SUMMARY.md

@@ -0,0 +1,107 @@
+---
+phase: 34-i18n-foundation
+plan: "08"
+subsystem: i18n
+tags: [i18n, german, locale, gap-closure]
+dependency_graph:
+  requires: [34-06, 34-07]
+  provides: [german-locale-parity]
+  affects: [src/client/locales/de]
+tech_stack:
+  added: []
+  patterns: [json-locale-files, i18n-key-parity]
+key_files:
+  created: []
+  modified:
+    - src/client/locales/de/common.json
+    - src/client/locales/de/settings.json
+    - src/client/locales/de/threads.json
+    - src/client/locales/de/setups.json
+    - src/client/locales/de/collection.json
+decisions:
+  - Used single quotes instead of German-style „ „ curly quotes in dangerZoneDescription to avoid JSON syntax errors
+metrics:
+  duration: ~8 minutes
+  completed: 2026-04-18
+  tasks_completed: 1
+  tasks_total: 1
+  files_modified: 5
+---
+
+# Phase 34 Plan 08: German Translation Gap Closure Summary
+
+**One-liner:** Added 58 missing German translation keys across 5 de/*.json locale files to achieve full key parity with English, fixing fallback display for home, profile, threads, setups, and collection sections.
+
+## Objective
+
+Close the German translation gap identified in VERIFICATION.md — plans 34-06/34-07 wired useTranslation into routes and fixed umlaut encoding, but never added corresponding German translations for the new English keys.
+
+## Tasks Completed
+
+| Task | Name | Commit | Files |
+|------|------|--------|-------|
+| 1 | Add 58 missing German translations to 5 de/*.json files | 23172f7 | de/common.json, de/settings.json, de/threads.json, de/setups.json, de/collection.json |
+
+## Key Changes
+
+### de/common.json — 34 keys added
+- `home.*` (3 keys): popularSetups, recentlyAdded, trendingCategories
+- `imageUpload.*` (4 keys): clickToAdd, invalidType, tooLarge, uploadFailed
+- `profile.*` (27 keys): full profile management section including account info, password management, danger zone
+
+### de/settings.json — 4 keys added
+- `currency.suggestion`: currency region suggestion with `{{symbol}}` and `{{code}}` interpolation
+- `currency.switch`: switch button label
+- `showConversions.title` + `showConversions.description`: price conversion toggle
+
+### de/threads.json — 11 keys added
+- `card.candidates` + `card.candidates_one`: pluralized candidate count with `{{count}}` interpolation
+- `planning.*` (9 keys): full planning section with step-by-step guidance
+
+### de/setups.json — 3 keys added
+- `card.by`: attributed author with `{{name}}` interpolation
+- `card.anonymous`: anonymous attribution
+- `impact.compareWith`: setup comparison prompt
+
+### de/collection.json — 6 keys added
+- `tabs.setups`: setups tab label
+- `totals.totalWeight` + `totals.totalCost`: totals bar labels
+- `classificationBadge.base` + `classificationBadge.worn` + `classificationBadge.consumable`: classification badge labels
+
+## Verification
+
+```
+bun test tests/i18n/locales.test.ts
+19 pass, 0 fail (previously 14 pass, 5 fail)
+```
+
+ASCII umlaut fallback check: 0 matches (no regressions).
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 1 - Bug] Fixed JSON syntax error from smart quotes in dangerZoneDescription**
+- **Found during:** Task 1 — test run revealed `SyntaxError: JSON Parse error: Expected '}'`
+- **Issue:** The German translation for `dangerZoneDescription` used German-style curly double-quotes `„Gelöschter Benutzer"` — the closing `"` (U+201C) was parsed by the JSON parser as the string-closing delimiter, causing a syntax error at line 115
+- **Fix:** Replaced curly quotes with straight single quotes: `'Gelöschter Benutzer'`
+- **Files modified:** src/client/locales/de/common.json
+- **Commit:** 23172f7
+
+## Known Stubs
+
+None — all translation keys have real German text values, no placeholders.
+
+## Threat Flags
+
+None — plan modifies static bundled locale JSON files only. No network endpoints, auth paths, or schema changes introduced.
+
+## Self-Check: PASSED
+
+- [x] src/client/locales/de/common.json — exists and valid JSON
+- [x] src/client/locales/de/settings.json — exists and valid JSON
+- [x] src/client/locales/de/threads.json — exists and valid JSON
+- [x] src/client/locales/de/setups.json — exists and valid JSON
+- [x] src/client/locales/de/collection.json — exists and valid JSON
+- [x] Commit 23172f7 exists
+- [x] bun test tests/i18n/locales.test.ts: 19 pass, 0 fail