docs(quick-260701-abc): fix i18n missing keys — summary and state update

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.planning/quick/260701-abc-i18n-missing-keys/260701-abc-SUMMARY.md

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+---
+quick_id: 260701-abc
+status: complete
+date: 2026-07-01
+commit: e5b76b7
+---
+
+# Summary: Fix i18n Missing Keys
+
+## What was done
+
+Fixed two i18n bugs found during UAT testing.
+
+### Bug 1: marketplace.accessDenied missing
+Added `"accessDenied"` to the `marketplace` section in both `de.json` and `en.json`. The marketplace page uses `useTranslations('marketplace')` and calls `t('accessDenied')` — the key existed at top level but not under the marketplace namespace.
+
+### Bug 2: calendar-source-form.tsx hardcoded English
+Added 12 new translation keys to `widgets.calendar` in both locale files:
+`formFieldName`, `formFieldType`, `formFieldUrl`, `formFieldUsername`, `formFieldPassword`,
+`formFieldColor`, `formFieldExchangeMode`, `formSave`, `formSaving`, `formCancel`,
+`formUrlErrorHttps`, `formUrlErrorInvalid`
+
+Replaced all hardcoded English strings in `calendar-source-form.tsx` with `t()` calls.
+Removed the locale-detection hack on the Cancel button (`t('calendar.addSource') === 'Add source' ? 'Cancel' : 'Abbrechen'`).
+
+## Verification
+- Browser confirmed: calendar form shows "Typ", "Benutzername", "Passwort", "Farbe", "Speichern", "Abbrechen"
+- Browser confirmed: marketplace console no longer shows MISSING_MESSAGE error
+- TypeScript: no errors