refs #12336 カートロジック修正

カート内表示スクリプト修正
各種コメント追加
Merge branch 'development' of ssh://svn.webimpact.co.jp/home/git/AOKI_EC into cart
fix bug of quantity selectbox in template order/add_goods
Merge branch 'development' into products_dev
Fix order lang file.
apply new design to template item_question/show
apply new design to template order/edit
Fixed child_groups not an array problem
Apply design to order
Templates optimization
Templates optimization
Add get_header/footer api function
Optimize code of get_size in order
Code/js optimization
Remove unused code
Use const instead of magic strings.
Code format optimization
fixed bug of order_test(change order_item to array)
fixed bug of wrong parameter to test_validate_order
Add name field of static_page