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/analytics.en.md

@@ -0,0 +1,29 @@
+
+# Analytics
+
+The **Analytics** area (`/analytics`) is a public dashboard with
+metrics and charts based on all tools and ratings.
+
+## Metrics (KPI cards)
+
+- **Number of tools** — how many tools are recorded in the catalog.
+- **Number of ratings** — how many ratings were submitted in total.
+- **Active categories** — how many categories exist.
+- **Average rating** — global combined value.
+
+## Charts
+
+| Chart | Content |
+| --- | --- |
+| **Top 8 tools** | Bar chart of the tools with the highest combined score (0–5) |
+| **Tools per category** | Radar chart of the number of tools per category |
+| **Score distribution** | Two horizontal bar charts (usefulness & usability) per star |
+
+The charts are interactive (tooltips on hover).
+
+## API
+
+- [`GET /analytics/summary`](/docs/reference/endpoints/analytics#getAnalyticsSummary)
+- [`GET /analytics/top-tools`](/docs/reference/endpoints/analytics#getTopTools)
+- [`GET /analytics/by-category`](/docs/reference/endpoints/analytics#getAnalyticsByCategory)
+- [`GET /analytics/rating-distribution`](/docs/reference/endpoints/analytics#getRatingDistribution)