alert_box_multiple 헬퍼 메소드 업데이트 함.

```ruby
def alert_box_multiple(kind, title, messages)
  content_tag :div, role: "alert", class: "alert alert-#{kind} alert-dismissible" do
    concat(content_tag(:button, type: 'button', class: 'close', data: {dismiss: 'alert'}) do
      content_tag(:span, raw('&times;'), 'aria-hidden' => 'true') +
      content_tag(:span, 'Close', class:'sr-only')
    end)
    concat(content_tag(:h4, title))
    concat(content_tag(:ul) do
      messages.map do |field, messages|
        messages.map do |message|
          content_tag :li, t("activerecord.attributes.question.#{field}") + message
        end.join('').html_safe
      end.join('').html_safe
    end)
  end
end
```