#1269 Resolved the bug to show correct {{eventName}} on compose message page

src/main/java/alfio/manager/support/CustomMessageManager.java

@@ -94,7 +94,7 @@ public void sendMessages(String eventName, Optional<Integer> categoryId, List<Me
                 .parallel()
                 .map(t -> {
                     Model model = new ExtendedModelMap();
-                    model.addAttribute("eventName", eventName);
+                    model.addAttribute("eventName", event.getDisplayName());
                     model.addAttribute("fullName", t.getFullName());
                     model.addAttribute("organizationName", organization.getName());
                     model.addAttribute("organizationEmail", organization.getEmail());

src/main/webapp/resources/angular-templates/admin/partials/custom-message/index.html

@@ -12,7 +12,7 @@ <h6>the syntax is defined by <a href="http://mustache.github.io/mustache.5.html"
             <dl class="wMarginTop">
 
                 <dt><span data-uib-tooltip="the name of the event" data-ng-non-bindable>{{eventName}}</span></dt>
-                <dd>{{eventName}}</dd>
+                <dd>{{eventDisplayName}}</dd>
 
                 <dt><span data-uib-tooltip="Either the name of the attendee or the name of the reservation owner" data-ng-non-bindable>{{fullName}}</span></dt>
                 <dd>{{fullName}}</dd>

src/main/webapp/resources/js/admin/ng-app/admin-application.js

@@ -2171,6 +2171,7 @@
                 var eventDescriptor = results[1].data;
                 $scope.organization = eventDescriptor.organization;
                 $scope.eventName = eventDescriptor.event.shortName;
+                $scope.eventDisplayName = eventDescriptor.event.displayName;
                 $scope.onlineEvent = eventDescriptor.event.online;
         });