Add language button and remove all others

extensions/fix_buttons/static/switch-language.js

@@ -0,0 +1,19 @@
+const switchLanguage = () => {
+  // Get current URL
+  let url = window.location.href;
+  let path = window.location.pathname;
+  let filename = path.split("/").pop();
+
+  // Detect if it's an English page
+  if (filename.endsWith(".en.html")) {
+    // Switch to German: remove ".en"
+    let newFilename = filename.replace(".en.html", ".html");
+    let newUrl = url.replace(filename, newFilename);
+    window.location.href = newUrl;
+  } else if (filename.endsWith(".html")) {
+    // Switch to English: add ".en"
+    let newFilename = filename.replace(".html", ".en.html");
+    let newUrl = url.replace(filename, newFilename);
+    window.location.href = newUrl;
+  }
+}