[FEATURE] Add internationalization support via GNU Gettext

[AnmiTaliDev]

Description

Add internationalization (i18n) support using GNU Gettext to enable multi-language support in the application.

Use case

The application currently supports only one language, limiting its accessibility to non-English speaking users. GNU Gettext is an industry-standard solution that would allow developers to mark translatable strings and provide translations for different locales, making the application accessible to a global audience.

Proposed solution

• Integrate GNU Gettext library into the project
• Wrap user-facing strings with gettext functions (gettext(), ngettext(), etc.)
• Extract translatable strings into .pot template files
• Create .po files for each supported language
• Compile .po files to .mo binary files for runtime use
• Add locale detection and switching mechanism based on system settings