feat: update URL param for duck mode activation

Changed URL query parameter from 'duckmode' to 'lang=quack' to improve clarity and maintain consistency with other language parameter conventions. This update helps ensure better readability and uniformity across the application.

assets/js/duckmode.js

@@ -24,7 +24,7 @@ function translateToDuckLanguage(node) {
     }
 }
 
-// Translate if the "duckmode" parameter is present in the URL
-if (window.location.search.includes('duckmode')) {
+// Translate if the "lang=quack" parameter is present in the URL
+if (window.location.search.includes('lang=quack')) {
     document.body.childNodes.forEach(translateToDuckLanguage);
 }