func NoButton() Button {
	return Button{Text: "gui.no"}
}
NoButton returns a Button which may be used as a default 'no' button for a modal form.
package form
import (
	"encoding/json"
	"fmt"
	"reflect"
)
type Modal struct {
	title, body string
	submittable ModalSubmittable
}
func NewModal(submittable ModalSubmittable, title ...interface{}) Modal {
	t := reflect.TypeOf(submittable)
	if t.Kind() != reflect.Struct {
		panic("submittable must be struct")
	}
	m := Modal{title: format(title), submittable: submittable}
	m.verify()
	return m
}
func YesButton() Button {
	return Button{Text: "gui.yes"}
}