Add Warning to Clone Channel Page

[WisTex]

Some people do not realize that cloning a channel on an untrusted website is a security risk. To make users aware of the risk, there should be a warning that says:

/!\ Caution! Only clone your identity on websites that you trust.

Or something similar.

[WisTex]

Warning. When you clone your identity, that hub becomes a custodian of your identity. Only clone your account onto hubs that you trust.