Land iMIP string changes (bug 343049) ui-r=dmose, r1=lilmatt, r2=dmose

calendar/locales/en-US/chrome/lightning/lightning.dtd

@@ -73,3 +73,6 @@
 <!ENTITY lightning.context.deleteitem.accesskey  "D">
 <!-- This access key is in the same menu as 'Go to Next' which gets the 'N'-->
 <!ENTITY lightning.context.newevent.accesskey  "E">
+
+<!-- iMIP Bar (meeting support) -->
+<!ENTITY lightning.imipbar.description "This message contains an invitation to an event.">

calendar/locales/en-US/chrome/lightning/lightning.properties

@@ -47,3 +47,7 @@ imipHtml.location=Location:
 imipHtml.when=When:
 imipHtml.organizer=Organizer:
 imipHtml.description=Description:
+
+imipAddToCalendar.label=Add To Calendar
+imipAddedItemToCal=Event Added to Calendar
+imipBarText=This message contains an invitation to an event.