Move hard-coded strings to i18n files

Add translations in English and in Japanese

i18n/en.yaml

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+# Content
+- id: dateFormat
+  translation: "January 2, 2006"
+- id: postedOnDate
+  translation: "Posted on {{ .Count }}"
+- id: readMore
+  translation: "Read More"
+- id: olderPosts
+  translation: "Older Posts"
+- id: newerPosts
+  translation: "Newer Posts"
+- id: previousPost
+  translation: "Previous Post"
+- id: nextPost
+  translation: "Next Post"
+
+# 404 page
+- id: pageNotFound
+  translation: "Whoops, this page doesn't exist. Move along. (404 error)"
+
+# Footer
+- id: poweredBy # Accepts HTML
+  translation: '<a href="http://gohugo.io">Hugo v{{ .Hugo.Version }}</a> powered &nbsp;&bull;&nbsp; Theme by <a href="http://deanattali.com/beautiful-jekyll/">Beautiful Jekyll</a> adapted to <a href="https://github.com/halogenica/beautifulhugo">Beautiful Hugo</a>'
+
+# Navigation
+- id: toggleNavigation
+  translation: "Toggle navigation"
+- id: gcseLabelShort
+  translation: "Search"
+- id: gcseLabelLong
+  translation: "Search {{ .Site.Title }}"
+- id: gcseClose
+  translation: "Close"
+

i18n/ja.yaml

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+# Content
+- id: dateFormat
+  translation: "2006年1月2日"
+- id: postedOnDate
+  translation: "{{ .Count }}に投稿"
+- id: readMore
+  translation: "続きを読む"
+- id: olderPosts
+  translation: "古いページ"
+- id: newerPosts
+  translation: "新しいページ"
+- id: previousPost
+  translation: "前ページ"
+- id: nextPost
+  translation: "次ページ"
+
+# 404 page
+- id: pageNotFound
+  translation: "おっと、このページが存在しない。他にあたってください。（404エラー）"
+
+# Footer
+- id: poweredBy # Accepts HTML
+  translation: '起動力に<a href="http://gohugo.io">Hugo v{{ .Hugo.Version }}</a> &nbsp;&bull;&nbsp; テーマに<a href="http://deanattali.com/beautiful-jekyll/">Beautiful Jekyll</a>に基づいている<a href="https://github.com/halogenica/beautifulhugo">Beautiful Hugo</a>'
+
+# Navigation
+- id: toggleNavigation
+  translation: "メニューを切り替え"
+- id: gcseLabelShort
+  translation: "検索"
+- id: gcseLabelLong
+  translation: "{{ .Site.Title }}を検索"
+- id: gcseClose
+  translation: "閉じる"
+