feat(locales): add Basque (eu) translation

[bingenm]

Hello!

This PR introduces the Basque (eu) translation for the CachyOS Welcome app.

• Created the i18n/eu/cachyos-hello.ftl file.
• Translated all strings into Basque.
• Kept all Fluent variables and formatting intact.
• Adapted Linux-specific terminology appropriately for Basque users.

Let me know if anything needs to be adjusted. Thank you for your work on CachyOS!

[Copilot]

Pull request overview

Adds Basque (eu) localization strings for the CachyOS Hello/Welcome application via a new Fluent translation file under i18n/.

Changes:

• Added a new Basque locale directory/file: i18n/eu/cachyos_hello.ftl
• Provided Basque translations for the existing set of Fluent message keys (including preserving variables like {$tweak} / {$package_name})

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[rdy7]

Nice work on the contribution.

This currently includes the i18n file, while other languages also have entries in /ui/cachyos-hello.glade, /cachyos-hello.desktop, and corresponding /data/pages/ content.

Adding those parts as well would help ensure the translation is fully integrated and visible in the application.

[bingenm]

Hi! I've just updated the PR.

I've completed all the requested parts:

Added the Basque (eu) entry to the .desktop file.

Updated the language selector in cachyos-hello.glade.

Created the full Basque translations for the data pages (involved, readme, and release).

Everything should be fully integrated now. Thanks for the guidance!