Changed font on splash screen:

- Motivation: splash screen is shown directly on page load, which means that the chosen typography (Roboto) has not been loaded yet. That means that our splash screen will first show its text with some default, already available font, before loading of Roboto has completed, and then it will re-render using Roboto. This leads to some ugly flickering which can be avoided if we exclude the splash screen from using Roboto.

new-client/public/index.css

@@ -27,7 +27,7 @@ body {
 }
 
 .app-start {
-  font-family: Helvetica, sans-serif;
+  font-family: Helvetica, Arial, sans-serif;
   position: absolute;
   top: 0;
   bottom: 0;