feat(i18n): full app + docs localization (de/en)

- translate remaining pages/components (admin, analytics, redundancy,
  trash, compare, browse, watchlist, admin tools tab, category combobox,
  theme toggle, tool preview card, tool-new/edit) to t() calls
- locales: 453 keys each, parity verified
- docs: bilingual handbook + release notes via *.en.md variants,
  language-aware docs.tsx (markdown paths, nav titles, search index),
  LanguageSwitcher in docs header
- generate-docs: emit per-locale handbook/release/search output,
  localized index.json fields (fileEn/titleEn), en-aware snapshots

docs/releases/v0.8.1/handbook/watchlist.en.md

@@ -0,0 +1,33 @@
+
+# Watchlist
+
+The **watchlist** is a personal favorites list. You can open and compare the
+tools in it at any time with a click.
+
+> The watchlist is a **premium feature** (Premium/Enterprise) and is always
+> available to admins.
+
+## Prerequisite
+
+You need a plan with the `watchlist` permission. If it is missing, a note
+about switching plans appears at the bookmark
+(see [Plans & permissions](/docs/handbook/plaene)).
+
+## Saving a tool
+
+- On every card/row in the **Browse tools** section you will find the
+  **bookmark icon**.
+- A click saves the tool to your watchlist — the icon becomes filled.
+- Clicking it again removes it.
+
+## Viewing the watchlist
+
+Open the watchlist via the user menu or the sidebar. It shows all saved tools
+as cards. The filled bookmark on a card removes the tool from the list.
+
+## Where is the watchlist stored?
+
+The watchlist is a list of tool IDs in your **user preferences**. This way it
+is linked to your account across devices.
+
+API reference: [`GET /auth/me/watchlist`](/docs/reference/endpoints/auth#getMeWatchlist).