feat(i18n): add translation for .readingTime in Chinese & Japanese (#285)

i18n/ja.yaml

@@ -17,6 +17,9 @@ article:
     lastUpdatedOn:
         other: 最終更新
 
+    readingTime:
+        other: "読了時間: {{ .Count }}分"
+
 notFound:
     title:
         other: 404 Not Found

i18n/zh-CN.yaml

@@ -17,6 +17,9 @@ article:
     lastUpdatedOn:
         other: 最后更新于
 
+    readingTime:
+        other: "阅读时长: {{ .Count }} 分钟"
+
 notFound:
     title:
         other: 404 错误