i18n(ja): reference/erros fix capitalization

[awwa]

Description (required)
This PR is based on the following changes:

#13911

Also, sync with the en content.
Add blank lines for diffing content.

I'd appreciate it if you could review this when you have time 🫡

[astrobot-houston]

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ja/reference/errors/unknown-clierror.mdx	Localization changed, will be marked as complete.
ja/reference/errors/unknown-csserror.mdx	Localization changed, will be marked as complete.

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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.

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[yanthomasdev]

LGTM! Thanks!