feat(i18n): add zh-CN translation

i18n/zh-CN.toml

@@ -0,0 +1,23 @@
+[toggleMenu]
+    other = "切换菜单"
+    
+[relatedContents]
+    other = "相关文章"
+
+[lastUpdatedOn]
+    other ="最后更新于 {{ .Count }}"
+
+[widgetArchiveTitle]
+    other = "归档"
+
+[widgetArchiveMore]
+    other = "更多"
+
+[widgetTagCloudTitle]
+    other = "标签云"
+
+[notFoundTitle]
+    other = "404 错误"
+
+[notFoundSubtitle]
+    other = "页面不存在"