Downgrade css to prevent older browsers displaying faulty views

public/js/bootstrap-loader.js

@@ -1,7 +1,7 @@
 (function () {
   'use strict';
 
-  const versions = Object.freeze({ app: '0.12.11', jquery: '4.0.0', jqueryUi: '1.14.2' });
+  const versions = Object.freeze({ app: '0.12.12', jquery: '4.0.0', jqueryUi: '1.14.2' });
   const steps = ['jquery', 'jquery-ui', 'modules', 'server', 'routes', 'location'];
   const progress = document.getElementById('bootstrap-progress');
   const errorBox = document.getElementById('bootstrap-error');
@@ -31,17 +31,6 @@
     });
   }
 
-  function loadStyle(href) {
-    return new Promise((resolve, reject) => {
-      const link = document.createElement('link');
-      link.rel = 'stylesheet';
-      link.href = versioned(href);
-      link.onload = resolve;
-      link.onerror = () => reject(new Error(`Stylesheet konnte nicht geladen werden: ${href}`));
-      document.head.appendChild(link);
-    });
-  }
-
   function initializeJqueryUi() {
     const $ = globalThis.jQuery;
     $('#bootstrap-retry').button({ icon: 'ui-icon-refresh' });
@@ -62,8 +51,6 @@
       );
       mark('jquery', 'done');
 
-      await loadStyle(`vendor/jquery-ui/jquery-ui-${versions.jqueryUi}.min.css`);
-      await loadStyle('css/app.css');
       await loadScript(
         `vendor/jquery-ui/jquery-ui-${versions.jqueryUi}.min.js`,
         () => globalThis.jQuery?.ui?.version === versions.jqueryUi