i18n(zh-cn): Update astro-i18n.mdx

src/content/docs/zh-cn/reference/modules/astro-i18n.mdx

@@ -40,6 +40,10 @@ import {
   notFound,
   middleware,
   requestHasLocale,
+  normalizeTheLocale,
+  pathHasLocale,
+  toCodes,
+  toPaths
  } from 'astro:i18n';
 ```
 
@@ -338,3 +342,116 @@ export const onRequest = defineMiddleware(async (context, next) => {
   return new Response("Not found", { status: 404 });
 })
 ```
+
+### `normalizeTheLocale()`
+
+<p>
+
+**类型：** `(locale: string) => string`
+</p>
+
+在返回小写版本之前，将给定语言环境中的下划线（ `_` ）替换为连字符（ `-` ）。
+
+```astro title="src/pages/index.astro"
+---
+import { normalizeTheLocale } from "astro:i18n";
+
+normalizeTheLocale("it_VT") // 返回 `it-vt`
+// 假设当前语言环境设置为 `"pt-PT"`：
+normalizeTheLocale(Astro.currentLocale) // 返回 `pt-pt`
+---
+```
+
+### `pathHasLocale()`
+
+<p>
+
+**类型：** `(path: string) => boolean`<br />
+<Since v="4.6.0" />
+</p>
+
+检查给定路径是否包含已配置的语言环境。
+
+这在使用依赖于 URL 路径中区域设置的 i18n 工具函数之前有助于防止错误。
+
+```js title="astro.config.mjs"
+export default defineConfig({
+  i18n: {
+    locales: [
+      { codes: ["it-VT", "it"], path: "italiano" },
+      "es"
+    ]
+  }
+})
+```
+
+```astro title="src/pages/index.astro"
+---
+import { pathHasLocale } from "astro:i18n";
+
+pathHasLocale("italiano"); // 返回 `true`
+pathHasLocale("es"); // 返回 `true`
+pathHasLocale('/es/blog/'); // 返回 `true`
+pathHasLocale("it-VT"); // 返回 `false`
+---
+```
+
+### `toCodes()`
+
+<p>
+
+**类型：** `(locales: Locales) => string[]`<br />
+<Since v="4.0.0" />
+</p>
+
+检索为配置中定义的每个区域设置配置的区域代码。当某个区域设置关联多个代码时，只有第一个代码会被添加到数组中。
+
+```js title="astro.config.mjs"
+export default defineConfig({
+  i18n: {
+    locales: [
+      { codes: ["it-VT", "it"], path: "italiano" },
+      "es"
+    ]
+  }
+})
+```
+
+```astro title="src/pages/index.astro"
+---
+import { i18n } from "astro:config/client";
+import { toCodes } from "astro:i18n";
+
+toCodes(i18n!.locales); // ["it-VT", "es"]
+---
+```
+
+### `toPaths()`
+
+<p>
+
+**类型：** `(locales: Locales) => string[]`<br />
+<Since v="4.0.0" />
+</p>
+
+检索配置中为每个已定义语言区域设置的路径。
+
+```js title="astro.config.mjs"
+export default defineConfig({
+  i18n: {
+    locales: [
+      { codes: ["it-VT", "it"], path: "italiano" },
+      "es"
+    ]
+  }
+})
+```
+
+```astro title="src/pages/index.astro"
+---
+import { i18n } from "astro:config/client";
+import { toPaths } from "astro:i18n";
+
+toPaths(i18n!.locales); // ["italiano", "es"]
+---
+```