Fix mobile support

script.js

@@ -75,12 +75,20 @@ document.addEventListener("DOMContentLoaded", () => {
 
 // Language support
 async function getLanguageData(lang){
+    if (!lang || lang === ""){
+        lang = "en";
+    }
+
     const response = await fetch(`languages/${lang}.json`);
     return response.json();
 }
 
 document.addEventListener("DOMContentLoaded", async () => {
     const userLang = navigator.language || navigator.userLanguage;
+    if (userLang === "de-DE"){
+        userLang = "de";
+    }
+
     const langData = await getLanguageData(userLang);
 
     document.querySelectorAll("[data-i18n]").forEach((element) => {