add the new CS epochDate template variable to the help system

lib/WebGUI/Help/Asset_Collaboration.pm

@@ -223,6 +223,7 @@ our $HELP = {
                     },
                     { 'name' => 'guid' },
                     { 'name' => 'pubDate' },
+                    { 'name' => 'epochDate' },
                     {   'name'      => 'attachmentLoop',
                         'variables' => [
                             { 'name' => 'attachment_thumbnail' },

lib/WebGUI/i18n/English/Asset_Collaboration.pm

@@ -1569,6 +1569,11 @@ the Collaboration Asset, the user will be notified.|,
 		lastUpdated => 1149656056,
 	},
 
+	'epochDate' => {
+		message => q|The date the item was published as an epoch date so that the Date macro can be used for custom date formatting.|,
+		lastUpdated => 1222106027,
+	},
+
 	'attachmentLoop' => {
 		message => q|A loop containg all attachements to this item (post).|,
 		lastUpdated => 1149656056,