[WIP] feat: detect browser language from `localStorage`

[BobbieGoede]

🔗 Linked issue

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [x] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This is still a work in progress!

Adds detectBrowserLanguage.useLocalStorage which can be set to string | undefined, when set to a string this will be used to attempt to retrieve stored language in localStorage on the client-side.

This could potentially be useful for projects that want to store language settings but are not able (or don't want to) to use cookies, as is the case for https://github.com/elk-zone/elk.

I think we may want to consider a similar pattern as the localeDetector we currently use for the server side translations feature.

📝 Checklist

• [ ] I have linked an issue or discussion.
• [ ] I have added tests (if possible).
• [ ] I have updated the documentation accordingly.

[BobbieGoede]

Closing as I think the solution for this use case can and should be resolved differently, based on recommendations by Daniel and Joaquin I'll explore a different approach for SSG, inserting translations in the page while detecting and translating during hydration client-side, though I'm not sure yet when I will have time to work on it.