fix button text

shared/templates/styleguide2/includes/organisms/layout/navbar.html

@@ -144,7 +144,7 @@
 
                     xl:w-auto
                   "
-                >{{ page.root_page.menu_button_name }}</div>
+                >{% if page.root_page.menu_button_name %}{{ page.root_page.menu_button_name }}{% else %}Zapoj se{% endif %}</div>
               </div>
 
               <div