[Cookbook]: Form Validationの翻訳 (#891)
[Cookbook]: Form Validationの翻訳 (#891)

* Translate "Base Example" section

* Translate 'Server-side validation' section

* Translate 'Alternative Pattern' section

* Replace from 'submit' to 'フォーム送信'

* Translate complete 'Server-side validation' section

* Transplate Custom-Validation section

* Remoce coming soon

* Resolve detailed phrasing and deficiencies

* Fix code comment translation mistake.

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