[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/page.tsx

@@ -83,7 +83,7 @@ export default function Home() {
                 </div>
                 <div className="flex items-center gap-3">
                   <div className="text-2xl">🌍</div>
-                  <p className="text-sm text-surface-400">5 languages incl. Arabic (RTL)</p>
+                  <p className="text-sm text-surface-400">31 languages incl. Arabic (RTL)</p>
                 </div>
               </div>
             </div>
@@ -579,7 +579,7 @@ export default function Home() {
             <div className="rounded-lg border border-surface-700/50 bg-surface-800/50 p-5 text-center hover:border-brand-500/50 transition-colors">
               <div className="text-3xl mb-2">🌍</div>
               <h3 className="text-sm font-semibold text-surface-50">i18n</h3>
-              <p className="text-xs text-surface-400 mt-1">5 languages, RTL</p>
+              <p className="text-xs text-surface-400 mt-1">31 languages, RTL</p>
             </div>
             <div className="rounded-lg border border-surface-700/50 bg-surface-800/50 p-5 text-center hover:border-brand-500/50 transition-colors">
               <div className="text-3xl mb-2">🔌</div>