quick frontend (chat): fixed use of old method printInfo

sat_frontends/quick_frontend/quick_chat.py

@@ -418,7 +418,10 @@ class QuickChat(quick_widgets.QuickWidget):
 
     def changeUserNick(self, old_nick, new_nick):
         """Change nick of a user in group list"""
-        self.printInfo("%s is now known as %s" % (old_nick, new_nick))
+        log.info("{old} is now known as {new} in room {room_jid}".format(
+            old = old_nick,
+            new = new_nick,
+            room_jid = self.target))
 
     ## Messages ##