Add english support for Valine comments

[stevenjoezhang]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines.
• Tests for the changes was maked (for bug fixes / features).
  • Muse | Mist have been tested.
  • Pisces | Gemini have been tested.
• Docs in NexT website have been added / updated (for new features).

PR Type

What kind of change does this PR introduce?

• Bugfix.
• Feature.
• Code style update (formatting, local variables).
• Refactoring (no functional changes, no api changes).
• Build related changes.
• CI related changes.
• Documentation content changes.
• Other... Please describe:

What is the current behavior?

Issue resolved: N/A

What is the new behavior?

• Screenshots with this changes: N/A
• Link to demo site with this changes: N/A

How to use?

In NexT _config.yml:

...

Does this PR introduce a breaking change?

• Yes.
• No.

[1v9]

Is 'zh-cn' default value?

[stevenjoezhang]

Yes, only two available values😂

[ivan-nginx]

@stevenjoezhang same question as above: why zh-cn by default if default language anywhere is en?

[1v9]

@ivan-nginx https://valine.js.org/en/i18n.html

[ivan-nginx]

@1v9 I see. 2 build-in languages: en and cn. I don't understand why @stevenjoezhang set cn by default? Go ru language by default on creative_commons? Or for yandex_site_verification we will write comments above:

-# Yandex Webmaster tools verification setting
-# See: https://webmaster.yandex.ru
+# Настройки верификации Вебмастер-панели Яндекса
+# Смотрите: https://webmaster.yandex.ru

It is unacceptable.

Even Hexo have en language by default. Everywhere en language by default.
This. Is. International. Language.

[stevenjoezhang]

@ivan-nginx The reason is that leancloud, one of the major dependencies of valine, doesn't provide English webpage nor documentation. I believe most users of leancloud or valine are not English speakers. See: https://medium.com/leancloud/getting-leancloud-ready-for-the-english-speaking-audience-97793bb413f1

And it's not hard to make English default language, just need to modify layout/_third-party/comments/valine.swig

[ivan-nginx]

I suggest 2 way-outs:

1. lang: '{{ theme.valine.language }}' || 'zh-cn' → 'en'
2. As we can see here — screenshoots on cn lang, LC on cn too. So, then need to write title something like that: Valine (China) and drop down this comment after all multilingual comments.

Here is example, BTW: https://theme-next.org/docs/third-party-services/statistics-and-analytics/