function _requestRemoveLabel(target){
            var targetButton = $(target);

            $.ajax(targetButton.data("deleteUri"), {
                "method": "post",
                "data"  : {"_method": "delete"}
            })
            .done(function(){
                _removeLabel(targetButton.data("categoryName"), targetButton.data("labelId"));
            });
        }
Send AJAX request to remove label with specified delete button

@param target
@private