Fix issue where footer/name can break templates

stringify the template variables at render time

JSON.stringify - will escape out quotes
<%- renders as-is without any more escaping

dashboard/proxyauth.html

@@ -4,12 +4,13 @@
     <title><%= name %> Login</title>
 
     <script>
-      window.cloudron = {};
-      window.cloudron.name = '<%= name %>';
-      window.cloudron.iconUrl = '<%- iconUrl %>';
-      window.cloudron.loginUrl = '<%- loginUrl %>';
-      window.cloudron.language = `<%= language %>`;
-      window.cloudron.apiOrigin = `<%= apiOrigin %>`;
+      window.cloudron = <%- JSON.stringify({
+        name: name,
+        iconUrl: iconUrl,
+        loginUrl: loginUrl,
+        language: language,
+        apiOrigin: apiOrigin
+      }) %>;
     </script>
 
   </head>