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Some minor code changes that were bothering me, 1.21 port, and a new language (Chinese Simplified) thanks to @GuoDaiYi!

Changelog

• Included Chinese Simplified lang file. #16 (@GuoDaiYi)

I am not going to bother porting this version to <1.20.5 as this version doesn't add anything worth the effort. Just use v1.2.3.