Translate the web UI to English (i18n setup)

[vgpastor]

Context

The web app is currently in Spanish only. To attract international contributors and users, we need to add English as a second language.

What needs to happen

• Set up an i18n solution compatible with Next.js 15 App Router (e.g., next-intl or similar)
• Extract hardcoded Spanish strings from key pages (home, map view, login)
• Create English translation files
• Add a language switcher component

Where to look

• src/app/ — Pages with hardcoded strings
• src/components/ — UI components

Tech

• Next.js 15 App Router, React 19
• Tailwind CSS for styling

Note

This is a larger task — feel free to start with just the i18n setup + one page as a proof of concept.

Acceptance criteria

• i18n framework integrated
• At least the home page + login available in English
• Language switcher visible in the UI