Fix #1054

Author: jmerle

views/service-worker.js.erb

@@ -50,7 +50,7 @@ self.addEventListener('fetch', event => {
       <%# The index page will make sure the correct documentation or a proper offline page is shown  %>
       const pathname = url.pathname;
       const filename = pathname.substr(1 + pathname.lastIndexOf('/')).split(/\#|\?/g)[0];
-      if (url.origin === location.origin && !filename.includes('.')) {
+      if (url.origin === location.origin && !['.css', '.js', '.json', '.png', '.ico', '.svg', '.xml'].some(ext => filename.endsWith(ext))) {
         const cachedIndex = await caches.match('/');
         if (cachedIndex) return cachedIndex;
       }