Added new label to extended room info. JM-98

git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@773 b35dd754-fafc-0310-a699-88a17e54d16e

src/i18n/messenger_i18n_en.properties

@@ -111,6 +111,7 @@ muc.roomIsNowMembersOnly=This room is now members-only.
 muc.extended.info.desc=Description
 muc.extended.info.subject=Subject
 muc.extended.info.occupants=Number of occupants
+muc.extended.info.creationdate=Creation date
 # Labels for room registration data form
 muc.form.reg.title=Registration with the room
 muc.form.reg.instruction=Please provide the following information to register with this room.