add variables for appVersions on layout.html

src/server/views/layout/layout.html

@@ -71,6 +71,7 @@
 <div id="wrapper">
 
   {% block layout_head_nav %}
+  {% set appVersion = window.navigator.appVersion.toLowerCase() %}
     <nav id="grw-navbar" class="navbar grw-navbar sticky-top grw-navbar-for-old-ios navbar-expand navbar-dark  mb-0 px-0"></nav>
   {% endblock  %} {# layout_head_nav #}