docs(i18n): add Spanish, Portuguese (BR), and German translations

177 translated MDX + _meta.js files across content/{es,pt-BR,de}/,
generated by scripts/translate-content.mjs against content/en/. Each
locale tree mirrors the English structure (59 files: 53 MDX pages +
6 _meta.js sidebar configs).

The build does not yet emit /es, /pt-BR, /de routes — generateStaticParams
in app/[lang]/layout.tsx still returns only en. The follow-up commit
flips the switch. This separation lets the content land independently
of the public locale rollout.

Translation preserves code blocks, JSX components, frontmatter keys,
URLs, API endpoint paths, header names, parameter names, brand names,
and library identifiers verbatim. Internal /en/ links in source are
rewritten to /{locale}/ in each translated copy so cross-page nav
stays within the page's own locale tree.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Mlaz-code

content/de/_meta.js

@@ -0,0 +1,11 @@
+export default {
+  index: "Einführung",
+  quickstart: "Schnellstart",
+  authentication: "Authentifizierung",
+  pricing: "Preise",
+  "api-reference": "API-Referenz",
+  streaming: "Streaming",
+  concepts: "Grundkonzepte",
+  sdks: "SDKs",
+  examples: "Beispiele",
+}

content/de/api-reference/_meta.js

@@ -0,0 +1,88 @@
+export default {
+  overview: "Übersicht",
+  conventions: "Antwortkonventionen",
+  "---Reference": {
+    type: "separator",
+    title: "Referenzdaten",
+  },
+  sports: "Sportarten",
+  leagues: "Ligen",
+  sportsbooks: "Sportsbooks",
+  markets: "Märkte",
+  "---Odds": {
+    type: "separator",
+    title: "Quoten",
+  },
+  odds: "Quoten-Snapshot",
+  "odds-delta": "Quoten-Delta",
+  "odds-best": "Beste Quoten",
+  "odds-comparison": "Quotenvergleich",
+  "odds-batch": "Batch-Quoten",
+  "odds-closing": "Schlussquote",
+  "---Teams": {
+    type: "separator",
+    title: "Teams",
+  },
+  teams: "Teams",
+  "---Events": {
+    type: "separator",
+    title: "Events",
+  },
+  events: "Events",
+  "events-by-id": "Event-Details",
+  "events-odds": "Event-Quoten",
+  "events-markets": "Event-Märkte",
+  "---Splits": {
+    type: "separator",
+    title: "Wettverteilung",
+  },
+  splits: "Wettverteilung",
+  "---LiveGameState": {
+    type: "separator",
+    title: "Live-Spielstand",
+  },
+  gamestate: "Live-Spielstand",
+  "---Opportunities": {
+    type: "separator",
+    title: "Möglichkeiten",
+  },
+  "opportunities-ev": "+EV-Möglichkeiten",
+  "opportunities-arbitrage": "Arbitrage",
+  "opportunities-middles": "Middles",
+  "opportunities-middles-summary": "Middles-Zusammenfassung",
+  "opportunities-low-hold": "Low Hold",
+  "---DeepLinks": {
+    type: "separator",
+    title: "Deep Links",
+  },
+  deeplinks: "Deep Links",
+  "---Streaming": {
+    type: "separator",
+    title: "Streaming",
+  },
+  stream: "SSE-Stream",
+  websocket: "WebSocket-Stream",
+  "---Account": {
+    type: "separator",
+    title: "Konto",
+  },
+  account: "Kontoinformationen",
+  "account-usage": "Nutzungsstatistiken",
+  "account-keys": "API-Key-Verwaltung",
+  "---Historical": {
+    type: "separator",
+    title: "Historisch (Sharp+)",
+  },
+  "historical-clv": "Closing Line Value (CLV)",
+  "historical-odds-closing": "Schlussquoten nach Datum",
+  "---Enterprise": {
+    type: "separator",
+    title: "Enterprise",
+  },
+  enterprise: "Enterprise-Endpoints",
+  "---Internal": {
+    type: "separator",
+    title: "Intern",
+  },
+  health: "Health Check",
+}