use https://github.com/nunocoracao/blowfish.git

themes/blowfish/exampleSite/content/samples/external/index.it.md

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+---
+title: "An External Article"
+date: 2019-01-24
+externalUrl: "https://nunocoracao.com/projects/"
+summary: "The `externalUrl` front matter parameter can link to any URL."
+showReadingTime: true
+_build:
+  render: "false"
+  list: "local"
+type: 'sample'
+---
+
+This page uses the `externalUrl` front matter parameter to link to an article outside of this Hugo website.
+
+It's great for things like linking to posts on Medium or to research papers you may have hosted on third party websites.

themes/blowfish/exampleSite/content/samples/external/index.ja.md

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+---
+title: "外部の記事"
+date: 2019-01-24
+externalUrl: "https://nunocoracao.com/projects/"
+summary: "`externalUrl` 表示は任意の URL にリンクすることができます。"
+showReadingTime: true
+_build:
+  render: "false"
+  list: "local"
+type: 'sample'
+---
+
+このページは、 `externalUrl` 表示パラメータを利用して、この Hugo ウェブサイト外の記事とリンクしています。
+
+Medium の投稿へのリンクや、サードパーティのウェブサイトでホストしている研究論文へのリンクなどに最適です。

themes/blowfish/exampleSite/content/samples/external/index.md

@@ -0,0 +1,15 @@
+---
+title: "An External Article"
+date: 2019-01-24
+externalUrl: "https://nunocoracao.com/projects/"
+summary: "The `externalUrl` front matter parameter can link to any URL."
+showReadingTime: true
+_build:
+  render: "false"
+  list: "local"
+type: 'sample'
+---
+
+This page uses the `externalUrl` front matter parameter to link to an article outside of this Hugo website.
+
+It's great for things like linking to posts on Medium or to research papers you may have hosted on third party websites.

themes/blowfish/exampleSite/content/samples/external/index.zh-cn.md

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+---
+title: "外部文章"
+date: 2019-01-24
+externalUrl: "https://nunocoracao.com/projects/"
+summary: "`externalUrl` front matter 参数可以链接到任何外部 URL."
+showReadingTime: true
+_build:
+  render: "false"
+  list: "local"
+type: 'sample'
+---
+
+此页面使用 `externalUrl` front matter 参数链接到 Hugo 网站之外的文章。
+
+它非常适合链接到 Medium 上的帖子或在第三方网站上托管的文章。