guys how is it possible to change the menu buttons like it shown in the video.
that Messaging thing is ok
but the menu buttons got changed server side how?
It didn't get changed server side. If it was happening to the host, then he has an add-on that allows users to have a backdoor exploit to the host's console. Most likely thing is that he changed it himself using the GUI editor and no hacking was involved.
Obviously a serverside mod.
A server sided mod cannot alter an object on a client directly unless it happened to the host of a non-dedicated.