Make non-HTTPS message more harsh

As browsers are placing more and more new functionality as
secure-context only, we need to prepare users for more problems. I find
it likely that we will disable non-HTTPS connections in the future.

app/ui.js

@@ -66,7 +66,7 @@ const UI = {
         // insecure context
         if (!window.isSecureContext) {
             // FIXME: This gets hidden when connecting
-            UI.showStatus(_("HTTPS is required for full functionality"), 'error');
+            UI.showStatus(_("Running without HTTPS is not recommended, crashes or other issues are likely."), 'error');
         }
 
         // Try to fetch version number