Bug 301748 calIFileType isn't l10n friendly, r=mvl

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

@@ -307,3 +307,8 @@ likelyTimezone=America/New_York
 
 # Print Layout
 formatListName = List
+
+# Import/Export
+htmlDesc=HTML
+icsDesc=iCalendar
+outlookDesc=Comma Separated Values (from Outlook)