fix(theme-translations): improve grammar of zh translation

[AkagiYui]

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[Josh-Cena]

Hi! This part is directly taken from Medium's "2 min read" format. If you ask me, I'll say it's not grammatical in English either. However, I don't know if Medium is available in Chinese translations, so I don't know how to translate it most appropriately. Do you have links to a few Chinese blogs showing similar text labels?

[AkagiYui]

Many are like "Reading Time: X minutes"

• https://konfan.cn/2022/01/14/SpringCloudAlibaba/
• https://owomoe.net/dev/182.html
• https://dwd.moe/p/mac-php.html
• https://blog.idc.moe/archives/build-ocserv-for-anyconnect.html

Because I don't want colon, I change it to "Reading needs X minutes"(阅读需要 X 分钟).

[Josh-Cena]

To be fair, I use the same translation for my own site as well: https://joshcena.com/zh-Hans/blog/

So yes, I would accept this. Could you update zh-Hant as well?

[Josh-Cena]

Thanks!