Hello there,
that is actually very simple, navigate to the file containing your command(s) you want to change, for ban/kick use:
"addons/ulx/lua/ulx/modules/sh/util.lua"
All you have to do is to change the log message, e.g.:
ulx.fancyLogAdmin( calling_ply, "#A kicked #T", target_ply )
Cheers,
Avoid