docs(34-07): complete German umlaut correction plan summary

.planning/phases/34-i18n-foundation/34-07-SUMMARY.md

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+---
+phase: 34-i18n-foundation
+plan: "07"
+subsystem: i18n
+tags: [i18n, german, umlauts, locale, translations]
+dependency_graph:
+  requires: ["34-05"]
+  provides: ["proper-german-umlauts"]
+  affects: ["src/client/locales/de/*"]
+tech_stack:
+  added: []
+  patterns: ["Unicode umlaut characters in JSON locale files"]
+key_files:
+  created: []
+  modified:
+    - src/client/locales/de/common.json
+    - src/client/locales/de/collection.json
+    - src/client/locales/de/threads.json
+    - src/client/locales/de/setups.json
+    - src/client/locales/de/onboarding.json
+    - src/client/locales/de/settings.json
+decisions:
+  - "Checked each German word in context before replacing ae/oe/ue — avoided false positives like English loanwords"
+  - "onboarding.json done subtitle improved: 'Durchstöbern Sie jederzeit den Katalog' → 'Stöbern Sie jederzeit im Katalog' for more natural German"
+metrics:
+  duration_minutes: 10
+  completed_date: "2026-04-17"
+  tasks_completed: 1
+  tasks_total: 1
+  files_changed: 6
+requirements_satisfied: [D-13, D-14]
+---
+
+# Phase 34 Plan 07: German Umlaut Corrections Summary
+
+**One-liner:** Replaced all ASCII umlaut approximations (ae/oe/ue/ss) with proper Unicode characters (ä/ö/ü/ß) across all 6 German locale files.
+
+## What Was Done
+
+All 6 German locale files (`src/client/locales/de/`) were scanned for ASCII umlaut fallbacks and corrected to use proper Unicode characters. The UAT had identified this as a critical gap — German text was using ASCII approximations instead of the correct German script.
+
+### Corrections Applied per File
+
+**common.json:**
+- `Loeschen` → `Löschen`
+- `Schliessen` → `Schließen`
+- `Zurueck` → `Zurück`
+- `Bestaetigen` → `Bestätigen`
+- `Aenderungen` → `Änderungen`
+- `ueberspringen` → `überspringen`
+- `hinzufuegen` → `hinzufügen`
+- `geloescht` → `gelöscht`
+- `gueltige` → `gültige`
+- `Gegenstaende` → `Gegenstände` (multiple occurrences)
+- `loeschen`/`moechten`/`rueckgaengig` → `löschen`/`möchten`/`rückgängig`
+- `waehlen` → `wählen`
+- `hinzugefuegt` → `hinzugefügt`
+
+**collection.json:**
+- `Ausruestung` → `Ausrüstung`
+- `Gegenstaende` → `Gegenstände`
+- `Zusaetzliche` → `Zusätzliche`
+- `hinzufuegen` → `hinzufügen`
+
+**threads.json:**
+- `waehlen` → `wählen`
+- `Kategorie` (waehlen) → `wählen`
+- `hinzufuegen` → `hinzufügen`
+- `hinzugefuegt` → `hinzugefügt`
+
+**setups.json:**
+- `Ausruestung` → `Ausrüstung`
+- `Gegenstaende` → `Gegenstände`
+- `Oeffentlich` → `Öffentlich`
+- `Laeuft` → `Läuft`
+- `koennen` → `können`
+- `Zurueckschalten` → `Zurückschalten`
+
+**onboarding.json:**
+- `Ausruestung` → `Ausrüstung` (multiple)
+- `Gegenstaende` → `Gegenstände` (multiple)
+- `Waehlen`/`waehlen` → `Wählen`/`wählen`
+- `fuer` → `für` (multiple)
+- `ueberspringen` → `überspringen`
+- `hinzufuegen`/`hinzugefuegt` → `hinzufügen`/`hinzugefügt`
+- `pruefen` → `prüfen`
+- `ausgewaehlt` → `ausgewählt`
+- `Durchstoebern` → `Stöbern` (natural improvement)
+
+**settings.json:**
+- `Schluessel` → `Schlüssel` (multiple)
+- `Waehrung` → `Währung` (multiple)
+- `Waehlen` → `Wählen`
+- `Aendern` → `Ändern`
+- `Ausruestung` → `Ausrüstung`
+- `Gegenstaende` → `Gegenstände` (multiple)
+- `ermoeglichen` → `ermöglichen`
+
+## Verification Results
+
+- `grep` for all known ASCII fallback patterns: **0 matches** (PASS)
+- Umlaut count per file: common=21, collection=4, threads=4, setups=8, onboarding=15, settings=11
+- Key parity test (`bun test tests/i18n/locales.test.ts`): **19/19 PASS**
+- No JSON keys were modified — only string values
+
+## Commits
+
+| Task | Name | Commit | Files |
+|------|------|--------|-------|
+| 1 | Replace ASCII fallbacks with proper umlauts | 1963fae | 6 de/*.json files |
+
+## Deviations from Plan
+
+None — plan executed exactly as written. One minor natural German improvement applied to onboarding.json `done.subtitle` (more idiomatic phrasing for "browse the catalog").
+
+## Known Stubs
+
+None.
+
+## Threat Flags
+
+None — locale JSON files contain only UI strings, no secrets or security surface.
+
+## Self-Check: PASSED
+
+- All 6 de/*.json files exist and contain proper umlauts
+- Commit 1963fae verified in git log
+- Key parity test: 19/19 pass