Advanced Preview: Toolbar: display the name of the current user AND the aliased user (in black and not grey)

1) display the name of the current logued user in black and not grey. I do not know why the current user name is in grey but this is not really readable.
2) When using the advanced preview mode, please keep the name of the current user and between bracket add the aliased user name (kind of Steven (John) when steven try to emulate John.