Galician translation

Language ISO name: `gl`
Maintainer: nunhes
nunhes@gmail.com

Hi,
Galician is a language spoken primarily in Galicia, but with a historical presence that extends to the bordering regions of the northwestern Iberian Peninsula. It is the native language of nearly 2.5 million people in Galicia and thousands more in the Galician diaspora around the world, particularly in Latin America.

I have been dedicating myself to web development and training for several years. And I would like to contribute to this project by translating the content into my language: Galician.

该 issue 请求将教程翻译成加利西亚语，但没有指定文件、测试或翻译入口。首先检查 repository 的贡献和本地化结构，以确定翻译范围；完成的标准是，约定的教程内容已提供加利西亚语版本，并遵循项目的约定。

由索引模型根据 Issue 内容生成。