[telnet] Client does not like UTF-8

[mfld-fr]

To test the ELKS telnet client, I connect to my Linux workstation that is configured in UTF-8 for almost everything. The telnet server is the Busybox applet sudo busybox telnetd -F. I don't know at this stage where the wrong thing is (client ? server ? failed negociation ?), but the result is uggly.