Chinese example doesn't work about gtts HOT 3 CLOSED

@beew Oh no, thank you! Let me take a look!

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@beew Ah! So I've found the issue, and it's two-fold, plus an extra thing I discovered:

1. The documentation should be updated. That language is not available anymore.
2. However, this should have still worked. There's a function in the code which converts the old language codes into the current ones, while raising a DeprecationWarning so nothing breaks. However, the CLI doesn't use it during the pre-validation of the language passed, so that's a bug.

And also:
3. The .cn endpoint doesn't seem to work anymore, if you go to http://translate.google.cn it tells you to use https://translate.google.com.hk instead

I'll work on those fixes.

In the meantime, here are workarounds:

gtts-cli '你好' --tld com.hk --lang zh-CN --output 你好.mp3

Or simply, if google.com is available in your location:

gtts-cli '你好' --lang zh-CN --output 你好.mp3

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Fixed in gTTS 2.3.2!

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