Sprachausgabe/englisch gefixt

static/service-worker.js

@@ -1,15 +1,25 @@
 const CACHE_NAME = 'datumsrechner-cache-v1';
 const urlsToCache = [
   '/',
-  '/static/style.css',
   '/static/favicon.ico',
   '/static/favicon.png',
+  '/static/favicon.svg',
   '/static/logo.svg',
+  '/static/manifest.json',
 ];
 self.addEventListener('install', event => {
   event.waitUntil(
     caches.open(CACHE_NAME)
-      .then(cache => cache.addAll(urlsToCache))
+      .then(cache => {
+        // Füge nur existierende Dateien zum Cache hinzu
+        return Promise.allSettled(
+          urlsToCache.map(url => 
+            cache.add(url).catch(err => {
+              console.log('Failed to cache:', url, err);
+            })
+          )
+        );
+      })
   );
 });
 self.addEventListener('fetch', event => {