Most of the people dont know how to vote because the F1 and F2 arent advertised with the "vote kick initiated against XXXXX".
It should say, in their own language, "vote kick initiated against XXXXXX, press F1 to vote". F2 should not work as people that dont vote are having their say by not voting yes, because you require a certain number of people to vote.
On a vote kick the person should be banned for 30 minutes to an hour and the ban time should be settable by the person in charge of the server.