Fixed bug 1929: Notifications about Modifications

Notifications about Modifications don't show the Calendar name.
When an email notification is selected by the user, the calendar name
from which the event was changed is added to the email.

Needs to be translated.

UI/Templates/Appointments/SOGoAptMailReceipt.wox

@@ -23,6 +23,8 @@ h1, dd, .dl-list dt { margin-left: 130px; }
       <h1><var:string value="aptSummary" const:escapeHTML="NO"/></h1>
     
       <dl class="dl-horizontal">
+          <dt><var:string label:value="calendar_label" const:escapeHTML="NO"/></dt>
+          <dd><var:string value="calendarName" const:escapeHTML="NO"/></dd>     
         <var:if condition="apt.location.length"
         ><dt><var:string label:value="location_label" const:escapeHTML="NO"/></dt>
         <dd><var:string value="apt.location" const:escapeHTML="NO"/></dd></var:if>