security(website): refactor inline scripts and click handlers to external files to achieve 100% strict CSP compliance

website/lang-init.js

@@ -0,0 +1,26 @@
+(function() {
+    var savedLang = localStorage.getItem('koala_lang');
+    var browserLang = navigator.language.startsWith('de') ? 'de' : 'en';
+    var activeLang = savedLang || browserLang;
+    document.documentElement.classList.add('lang-' + activeLang);
+    document.documentElement.lang = activeLang;
+    
+    // Update titles dynamically based on page
+    var path = window.location.pathname;
+    var isIndex = path === '/' || path.endsWith('index.html') || path.split('/').pop() === '';
+    var isJoin = path.endsWith('join.html');
+    
+    if (isIndex) {
+        var titles = { 
+            en: 'KoalaSync | Real-time Video Synchronization for Friends', 
+            de: 'KoalaSync | Echtzeit-Video-Synchronisation für Freunde' 
+        };
+        document.title = titles[activeLang] || titles.en;
+    } else if (isJoin) {
+        var titles = { 
+            en: 'Join Room | KoalaSync', 
+            de: 'Raum beitreten | KoalaSync' 
+        };
+        document.title = titles[activeLang] || titles.en;
+    }
+})();