update messageTemplate binding to allow singluar/plural forms

rundeckapp/grails-app/assets/javascripts/ko/binding-message-template.js

@@ -4,6 +4,9 @@
  * Placeholders are in the form '{0}','{1}', etc.  The "messageTemplate" binding value can be a single value, which
  * will be used for {0}, or it can be an object with a 'value' property, possibly observable, containing an array
  * for the replacement values.
+ * If a binding "messageTemplatePluralize: true" is set, then the template text is treated as a singular and a plural
+ * version of the same text, separated by "|" character.  If the first bound data value is "1", then singular form
+ * is used, otherwise the plural form is used.
  *
  */
 ko.bindingHandlers.messageTemplate = {
@@ -14,8 +17,15 @@ ko.bindingHandlers.messageTemplate = {
         return { 'controlsDescendantBindings': true };
     },
     update:function(element, valueAccessor, allBindings, viewModel, bindingContext){
+        var pluralize=allBindings.get('messageTemplatePluralize');
         var data=ko.utils.unwrapObservable(valueAccessor());
         var template=jQuery(element).data('ko-message-template');
+        var pluralTemplate=null;
+        if(pluralize){
+            var arr = template.split('|');
+            template = arr[0];
+            pluralTemplate = arr[1];
+        }
         var values=[];
         if(typeof(data)!='object'){
             values=[data];
@@ -30,6 +40,9 @@ ko.bindingHandlers.messageTemplate = {
         for(var i=0;i<values.length;i++){
             values[i] = ko.utils.unwrapObservable(values[i]);
         }
+        if(pluralize && values[0]!=1){
+            template=pluralTemplate;
+        }
         var text = template.replace(/\{(\d+)\}/g,function(match, g1, offset, string){
             var val= parseInt(g1);
             if(val>=0 && val<values.length){