plugin XEP-0234: log file transfer "terminated" instead of "completed", as the file may not be complete (check is done after)

src/plugins/plugin_xep_0234.py

@@ -306,7 +306,7 @@ class XEP_0234(object):
         return True
 
     def _finishedCb(self, dummy, session, content_name, content_data, profile):
-        log.info(u"File transfer completed")
+        log.info(u"File transfer terminated")
         if content_data['senders'] != session['role']:
             # we terminate the session only if we are the receiver,
             # as recommanded in XEP-0234 §2 (after example 6)