[+] i18n SSR

src/hooks.server.ts

@@ -1,3 +1,25 @@
 import { checkAudioSeparator } from '$lib/server/separator';
+import type { Handle } from '@sveltejs/kit';
 
 checkAudioSeparator().catch(e => console.error('Audio separator check failed:', e));
+
+export const handle: Handle = async ({ event, resolve }) => {
+  const langCookie = event.cookies.get('lang');
+  if (langCookie === 'zh' || langCookie === 'en') {
+    event.locals.lang = langCookie;
+  } else {
+    const acceptLanguage = event.request.headers.get('accept-language');
+    // Simple check: if zh is present, prefer it (unless en is weighted higher, but let's keep it simple for now)
+    // A better parser would parse q-values.
+    // For now, let's assume if 'zh' is in the header, the user likely understands Chinese.
+    if (acceptLanguage && acceptLanguage.includes('zh')) {
+      event.locals.lang = 'zh';
+    } else {
+      event.locals.lang = 'en';
+    }
+  }
+  
+  return resolve(event, {
+    transformPageChunk: ({ html }) => html.replace('%lang%', event.locals.lang)
+  });
+};