Fix mobile view Bugs and add versions to static files for cache breaking

public/js/bootstrap-loader.js

@@ -1,12 +1,14 @@
 (function () {
   'use strict';
 
-  const versions = Object.freeze({ jquery: '4.0.0', jqueryUi: '1.14.2' });
+  const versions = Object.freeze({ app: '0.12.11', 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');
   const retry = document.getElementById('bootstrap-retry');
 
+  const versioned = path => `${path}${path.includes('?') ? '&' : '?'}v=${encodeURIComponent(versions.app)}`;
+
   function mark(step, state) {
     const item = document.querySelector(`[data-step="${step}"]`);
     if (!item) return;
@@ -18,7 +20,7 @@
   function loadScript(src, test) {
     return new Promise((resolve, reject) => {
       const script = document.createElement('script');
-      script.src = src;
+      script.src = versioned(src);
       script.async = false;
       script.onload = () => {
         if (test && !test()) reject(new Error(`Selbsttest fehlgeschlagen: ${src}`));
@@ -33,7 +35,7 @@
     return new Promise((resolve, reject) => {
       const link = document.createElement('link');
       link.rel = 'stylesheet';
-      link.href = href;
+      link.href = versioned(href);
       link.onload = resolve;
       link.onerror = () => reject(new Error(`Stylesheet konnte nicht geladen werden: ${href}`));
       document.head.appendChild(link);