i18n(ja): jellypad page, optimizely page, vault cms page

[fkatsuhiro]

Description (required)

Create jellypad page, optimizely page, vault cms page

Related issues & labels (optional)

• Suggested label: i18n

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Tracked Files

File	Note
ja/guides/cms/jekyllpad.mdx	Localization added, will be marked as complete.
ja/guides/cms/optimizely.mdx	Localization added, will be marked as complete.
ja/guides/cms/vault-cms.mdx	Localization added, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[trueberryless]

Thanks for your translation!

LGTM 🎉