Add missing content files for Simplified Chinese, change language code

content/blog/_index.zh-Hans.md

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+_index.md

content/blog/dolor/index.zh-Hans.md

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+index.md

content/blog/drafted-post/index.zh-Hans.md

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+index.md

content/blog/ipsum/index.zh-Hans.md

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+index.md

content/blog/long-long-man/index.zh-Hans.md

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+index.md

content/blog/lorem/index.zh-Hans.md

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+index.md

content/blog/the-quill-of-duck/index.zh-Hans.md

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+index.md