docs(l10n): localize 'Use Your Preferred Language' section in all 5 locale READMEs

Mirror the new section added to the root README. Each locale's link
list highlights the current language with ./README.md and points to the
others via ../<locale>/README.md (English uses ../../README.md).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: justinyoo

README.md

@@ -5,7 +5,7 @@
 [![Official Copilot CLI documentation](https://img.shields.io/badge/GitHub-CLI_Documentation-00a3ee?style=flat-square&logo=github)](https://docs.github.com/en/copilot/how-tos/copilot-cli) 
 [![Join AI Foundry Discord](https://img.shields.io/badge/Discord-AI_Community-blue?style=flat-square&logo=discord&color=5865f2&logoColor=fff)](https://aka.ms/foundry/discord)
 
-🎯 [What You'll Learn](#what-youll-learn)   ✅ [Prerequisites](#prerequisites)   🤖 [Copilot Family](#understanding-the-github-copilot-family)   📚 [Course Structure](#course-structure)   📋 [Command Reference](#-github-copilot-cli-command-reference)
+🎯 [What You'll Learn](#-what-youll-learn)   ✅ [Prerequisites](#-prerequisites)   🤖 [Copilot Family](#-understanding-the-github-copilot-family)   📚 [Course Structure](#-course-structure)   📋 [Command Reference](#-github-copilot-cli-command-reference)
 
 # GitHub Copilot CLI for Beginners
 
@@ -89,6 +89,12 @@ Each chapter follows the same pattern:
 
 The **[GitHub Copilot CLI command reference](https://docs.github.com/en/copilot/reference/cli-command-reference)** helps you find commands and keyboard shortcuts to help you use Copilot CLI effectively.
 
+## 🌐 Use Your Preferred Language
+
+This material is available in the following languages.
+
+[English](./README.md) | [Español](./localization/es-es/README.md) | [日本語](./localization/ja-jp/README.md) | [한국어](./localization/ko-kr/README.md) | [Português](./localization/pt-br/README.md) | [中文(简体)](./localization/zh-cn/README.md)
+
 ## 🙋 Getting Help
 
 - 🐛 **Found a bug?** [Open an Issue](https://github.com/github/copilot-cli-for-beginners/issues)

localization/es-es/README.md

@@ -89,6 +89,12 @@ Cada capítulo sigue el mismo patrón:
 
 La [**referencia de comandos de GitHub Copilot CLI**](https://docs.github.com/en/copilot/reference/cli-command-reference) te ayuda a encontrar comandos y atajos de teclado para usar Copilot CLI de forma eficaz.
 
+## 🌐 Usa tu idioma preferido
+
+Este material está disponible en los siguientes idiomas.
+
+[English](../../README.md) | [Español](./README.md) | [日本語](../ja-jp/README.md) | [한국어](../ko-kr/README.md) | [Português](../pt-br/README.md) | [中文(简体)](../zh-cn/README.md)
+
 ## 🙋 Obtener ayuda
 
 - 🐛 **¿Encontraste un error?** [Abre un Issue](https://github.com/github/copilot-cli-for-beginners/issues)

localization/ja-jp/README.md

@@ -84,6 +84,12 @@ GitHub Copilot は AI を活用したツールのファミリーへと進化し
 ## 📋 GitHub Copilot CLI コマンドリファレンス
 [**GitHub Copilot CLI コマンドリファレンス**](https://docs.github.com/en/copilot/reference/cli-command-reference) では、Copilot CLI を効果的に使うためのコマンドやキーボードショートカットを確認できます。
 
+## 🌐 お好みの言語で利用する
+
+この教材は以下の言語で提供されています。
+
+[English](../../README.md) | [Español](../es-es/README.md) | [日本語](./README.md) | [한국어](../ko-kr/README.md) | [Português](../pt-br/README.md) | [中文(简体)](../zh-cn/README.md)
+
 ## 🙋 ヘルプを得るには
 
 - 🐛 **バグを見つけた場合？** [Issue を開く](https://github.com/github/copilot-cli-for-beginners/issues)

localization/ko-kr/README.md

@@ -89,6 +89,12 @@ GitHub Copilot은 AI 기반 도구의 제품군으로 발전했습니다. 각 
 
 [**GitHub Copilot CLI 명령어 참조**](https://docs.github.com/en/copilot/reference/cli-command-reference)에서 Copilot CLI를 효과적으로 사용하는 데 도움이 되는 명령어와 키보드 단축키를 찾아볼 수 있습니다.
 
+## 🌐 선호하는 언어로 보기
+
+이 자료는 다음 언어로 제공됩니다.
+
+[English](../../README.md) | [Español](../es-es/README.md) | [日本語](../ja-jp/README.md) | [한국어](./README.md) | [Português](../pt-br/README.md) | [中文(简体)](../zh-cn/README.md)
+
 ## 🙋 도움 받기
 
 - 🐛 **버그를 발견하셨나요?** [이슈 열기](https://github.com/github/copilot-cli-for-beginners/issues)

localization/pt-br/README.md

@@ -89,6 +89,12 @@ Cada capítulo segue o mesmo padrão:
 
 A [**referência de comandos do GitHub Copilot CLI**](https://docs.github.com/en/copilot/reference/cli-command-reference) ajuda você a encontrar comandos e atalhos de teclado para usar o Copilot CLI com eficiência.
 
+## 🌐 Use seu idioma preferido
+
+Este material está disponível nos seguintes idiomas.
+
+[English](../../README.md) | [Español](../es-es/README.md) | [日本語](../ja-jp/README.md) | [한국어](../ko-kr/README.md) | [Português](./README.md) | [中文(简体)](../zh-cn/README.md)
+
 ## 🙋 Obtendo ajuda
 
 - 🐛 **Encontrou um bug?** [Abra uma issue](https://github.com/github/copilot-cli-for-beginners/issues)

localization/zh-cn/README.md

@@ -89,6 +89,12 @@ GitHub Copilot 已经发展成为一系列 AI 驱动的工具。下面是各个
 
 [**GitHub Copilot CLI 命令参考文档**](https://docs.github.com/en/copilot/reference/cli-command-reference) 可以帮你查找命令和键盘快捷键，从而更高效地使用 Copilot CLI。
 
+## 🌐 使用你的首选语言
+
+本教程提供以下语言版本。
+
+[English](../../README.md) | [Español](../es-es/README.md) | [日本語](../ja-jp/README.md) | [한국어](../ko-kr/README.md) | [Português](../pt-br/README.md) | [中文(简体)](./README.md)
+
 ## 🙋 获取帮助
 
 - 🐛 **发现 Bug？** [提交 Issue](https://github.com/github/copilot-cli-for-beginners/issues)