diff --git a/app/src/Scanner.svelte b/app/src/Scanner.svelte
index c89e607..376abf9 100644
--- a/app/src/Scanner.svelte
+++ b/app/src/Scanner.svelte
@@ -3,10 +3,18 @@
     <h1 class="mr-6 text-lg font-semibold text-right text-gray-900">minimum lap time: 10s</h1>
     <div class="w-full p-3 text-right">
         <div class="inline-block mr-2 mt-2"><button
+            on:click={()=>{
+        lang.set("de-DE");
+        }} 
+        class:bg-blue-700={$lang==="de-DE"}
         type="button" class="bg-black focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-black text-white text-sm py-2.5 px-5 rounded-md hover:bg-blue-700">Deutsch
         <svg class="h-4 inline" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M15.923 345.043C52.094 442.527 145.929 512 256 512s203.906-69.473 240.077-166.957L256 322.783l-240.077 22.26z" fill="#ffda44"></path><path d="M256 0C145.929 0 52.094 69.472 15.923 166.957L256 189.217l240.077-22.261C459.906 69.472 366.071 0 256 0z"></path><path d="M15.923 166.957C5.633 194.69 0 224.686 0 256s5.633 61.31 15.923 89.043h480.155C506.368 317.31 512 287.314 512 256s-5.632-61.31-15.923-89.043H15.923z" fill="#d80027"></path></svg></button></div>
         <div class="inline-block mr-2 mt-2">
             <button
+            on:click={()=>{
+                lang.set("en-EN");
+                }} type="button"
+                class:bg-blue-700={$lang==="en-EN"}
                 class="bg-black focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-black text-white text-sm py-2.5 px-5 rounded-md hover:bg-blue-700">English
         <svg class="h-4 inline" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><circle cx="256" cy="256" r="256" fill="#f0f0f0"></circle><g fill="#d80027"><path d="M244.87 256H512c0-23.106-3.08-45.49-8.819-66.783H244.87V256zM244.87 122.435h229.556a257.35 257.35 0 00-59.07-66.783H244.87v66.783zM256 512c60.249 0 115.626-20.824 159.356-55.652H96.644C140.374 491.176 195.751 512 256 512zM37.574 389.565h436.852a254.474 254.474 0 0028.755-66.783H8.819a254.474 254.474 0 0028.755 66.783z"></path></g><path d="M118.584 39.978h23.329l-21.7 15.765 8.289 25.509-21.699-15.765-21.699 15.765 7.16-22.037a257.407 257.407 0 00-49.652 55.337h7.475l-13.813 10.035a255.58 255.58 0 00-6.194 10.938l6.596 20.301-12.306-8.941a253.567 253.567 0 00-8.372 19.873l7.267 22.368h26.822l-21.7 15.765 8.289 25.509-21.699-15.765-12.998 9.444A258.468 258.468 0 000 256h256V0c-50.572 0-97.715 14.67-137.416 39.978zm9.918 190.422l-21.699-15.765L85.104 230.4l8.289-25.509-21.7-15.765h26.822l8.288-25.509 8.288 25.509h26.822l-21.7 15.765 8.289 25.509zm-8.289-100.083l8.289 25.509-21.699-15.765-21.699 15.765 8.289-25.509-21.7-15.765h26.822l8.288-25.509 8.288 25.509h26.822l-21.7 15.765zM220.328 230.4l-21.699-15.765L176.93 230.4l8.289-25.509-21.7-15.765h26.822l8.288-25.509 8.288 25.509h26.822l-21.7 15.765 8.289 25.509zm-8.289-100.083l8.289 25.509-21.699-15.765-21.699 15.765 8.289-25.509-21.7-15.765h26.822l8.288-25.509 8.288 25.509h26.822l-21.7 15.765zm0-74.574l8.289 25.509-21.699-15.765-21.699 15.765 8.289-25.509-21.7-15.765h26.822l8.288-25.509 8.288 25.509h26.822l-21.7 15.765z" fill="#0052b4"></path></svg></button></div>
     </div>
@@ -25,3 +33,5 @@
 </div>
 <script>
     import {apikey} from './store.js';
+    import {lang} from './store.js';
+</script>
\ No newline at end of file
diff --git a/app/src/store.js b/app/src/store.js
index 456da4f..84193fd 100644
--- a/app/src/store.js
+++ b/app/src/store.js
@@ -5,3 +5,8 @@ export const apikey = writable(stored_apikey);
 apikey.subscribe((value) => {
 	localStorage.setItem('apikey', value);
 });
+const stored_lang = localStorage.getItem('lang') === 'null' ? navigator.language : localStorage.getItem('lang');
+export const lang = writable(stored_lang);
+lang.subscribe((value) => {
+	localStorage.setItem('lang', value);
+});