Improve Chinese translation and correct a typo found in string identifier

[sikuai2333]

This PR includes:

1. Improved Simplified Chinese translations to make them more natural and fluent
2. Fixed a typo in ErrorDateMustBeFuture that I found during the translation process

I've tested these changes on an Android Studio emulator and everything works properly. Screenshots attached for reference.

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此PR包含：

1. 改进了简体中文翻译，使其更加自然流畅
2. 在翻译过程中，修改了ErrorDateMustBeFuture的拼写错误

我已经在AS模拟器上测试了这些更改，一切正常。附上几张截图供参考。