Docusaurus v2: fix i18n url error

[start940315]

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⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 62	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 81	🟢 100	🟢 100	🟢 100	🟢 90	Report

[Josh-Cena]

Thanks for the PR, but without a linked issue or a detailed motivation, I'm not really sure what you are achieving. I'll assume you are doing the same as #6731 (i.e. fixing #6462). I'm going to close this because the code obviously doesn't always work as intended, but feel free to send an issue detailing what's wrong with the current behavior.

[start940315]

Thanks for the PR, but without a linked issue or a detailed motivation, I'm not really sure what you are achieving. I'll assume you are doing the same as #6731 (i.e. fixing #6462). I'm going to close this because the code obviously doesn't always work as intended, but feel free to send an issue detailing what's wrong with the current behavior.

No, I'm fixing a bug. When I use the framework, after I chose a language, the locale added to the url one by one. I assumed it to be replaced. For example, my locales is ['en', 'zh-Hant', 'zh-Hans'], the initial url is http://localhost:3000/docu/docs/intro, after I chose zh-Hant then chose zh-Hans, the url became http://localhost:3000/zh-Hans/zh-Hant/docu/docs/intro. And I found currentLocale is not updated. So I fixed it locally and submited a pr.

[slorber]

@start940315 please create a repro showing the problem you are trying to solve: use docusaurus.new for that. We can't check your localhost URLs and inspect what's wrong.

I suspect you have a trailing slash issue leading to this bug, and fixing the trailing slash issue could fix your bug at the same time.

[Josh-Cena]

@slorber The bug is #8652