It is an add-on component and you got to buy this.
yes my friend i do have it. i already bought it. :)
is this option included in the Premium ?
Premium Version is available from softlab24. You have to pay for it.
You might want to look into the language selector module (probably with softlab24). That adds language selection to the header, but not the footer. Functionally, it works well but the location of the dropdown would be better if placed well in the layout (something to improve upon).