Add translation support for the website

[eliandoran]

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[github-actions]

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[eliandoran]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces internationalization support for the website using i18next, which is a great addition. The implementation covers adding dependencies, creating the initial English translation file, and updating components to use translation functions.

However, there are a few critical issues with the current implementation. The i18next setup in i18n.ts will not work as expected in a reactive framework like Preact, as it won't trigger UI updates on language change. This also leads to issues in files like download-helper.ts where translations are cached at module load time. I've also found a couple of bugs, such as a missing variable in a translation call and a wrong translation key being used.

My review includes detailed comments on these issues and suggestions for how to fix them by adopting standard react-i18next patterns, like using the useTranslation hook. Addressing these points will ensure the translation system is robust and works correctly.