[grade=pending] fix: update language count from 5 to 31 across marketing site

- Homepage hero: 5 → 31 languages incl. Arabic (RTL)
- Homepage integrations section: 5 → 31 languages, RTL
- Features page: 5 → 31 languages in description and feature list
- Docs/premium: Internationalization (5 → 31 languages)
- Pricing: i18n — 5 → 31 languages

The DC-077 i18n system expanded from 5 to 31 languages.

src/app/pricing/page.tsx

@@ -52,7 +52,7 @@ export default function PricingPage() {
     'Plugin/extension system',
     'REST API & MCP Server for AI assistants',
     'Prometheus metrics export',
-    'i18n — 5 languages (EN/ES/FR/DE/AR)',
+    'i18n — 31 languages (EN/ES/FR/DE/AR + 26 more)',
   ];
 
   const premiumFeatures = [