Code Review Bench PR #25696 - Align zh translations with China mainland terminology.

[tomerqodo]

Code Review Bench PR TryGhost#25696

Original PR Title: Align zh translations with China mainland terminology.
Original PR Description: ## PR Content

This branch tightens up the zh-CN wording; no new files added.

• Updated ghost/i18n/locales/zh/ghost.json for subscription/comment phrasing aligned with mainland usage and filled the missing “Subscription details” translation.
• Refined ghost/i18n/locales/zh/comments.json copy: consistent “评论/名字” terms and clearer load/show hints.
• Smoothed ghost/i18n/locales/zh/portal.json wording across subscription, email preferences, and error messages for a more natural, consistent tone.

Net result: portal and comments Chinese strings read more naturally, with the last missing translation now covered.

This PR modification applies solely to language conventions in mainland China.

Related PR

• Added Simplified Chinese (zh-Hans) and Updated some wordings in zh and zh-Hant TryGhost/Ghost#25030

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Note

Improves zh-CN locale consistency and naturalness with mainland terminology.

• Updates comments.json, ghost.json, and portal.json to consistently use 评论 and 姓名/名字, and clearer load/show hints
• Refines subscription, email preference, unsubscribe, and error/invite-only messages for more natural zh-CN phrasing
• Adds missing translation for "Subscription details" in ghost.json
• Text-only changes to i18n files; no functional or API changes

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Original PR URL: TryGhost#25696