Add hu_HU for Hungarian locale

[balazs-szucs]

Description of changes

Added Hungarian locale files, and corresponding translation

For the translation I mainly relied on my native skills, double checked my work using LLMs.

Copilot generated summary:

This pull request introduces Hungarian language support to the application by adding translations and updating the locale configurations. The most important changes include the addition of Hungarian translations in the .po file and registering the new locale in the application's supported locales.

Hungarian Language Support:

• Added Hungarian translations for various UI elements and messages in the po/hu_HU.UTF-8.po file. This includes translations for prompts, dialogs, menus, and other interface components.
• Updated the supported locales list in src/os/i18n.zig to include hu_HU.UTF-8, enabling Hungarian as an available language option.

Picture(s) of the translation