Remove multi-lingual support from frontend

[marcoacierno]

Removes Italian language support from the frontend codebase as requested in #4680.

Changes:

• Removed i18n config from Next.js
• Simplified locale context to always use English
• Removed ~1200 lines of Italian translations
• Removed language switching from header
• Updated 40+ pages to use DEFAULT_LOCALE
• Moved API routes from api/[lang]/ to api/

Closes #4680

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Project	Deployment	Actions	Updated (UTC)
pycon	Error		Jun 20, 2026 6:54pm

[claude]

This PR removes Italian language support from the Next.js frontend, deleting ~1200 lines of translations, removing i18n config, simplifying the locale context to always return English, and moving API routes from api/[lang]/... to api/....

Must-fix issues

Critical bug: page-static-props.ts uses undefined locale

frontend/src/components/page-handler/page-static-props.ts

DEFAULT_LOCALE is imported but never used. The function body still reads locale from the Next.js GetStaticProps context, but with i18n removed from next.config.js, context.locale will always be undefined. Every CMS/Wagtail page using getStaticProps from this file will send language: undefined to GraphQL. Replace locale with DEFAULT_LOCALE throughout getProps() — the import is already there.

Stale call signature in schedule-view

frontend/src/components/schedule-view/index.tsx line 304

getDayUrl(currentDay, language) still passes a second argument after the signature was changed to (day: string) in this PR. Silently ignored at runtime but is a type error.

Missing redirects for previously indexed URLs

The site previously served /en/* and /it/* paths. With no redirects added to next.config.js, all those URLs will 404 (breaking bookmarks and search engine links). Add:

{ source: '/en/:path*', destination: '/:path*', permanent: true },
{ source: '/it/:path*', destination: '/:path*', permanent: true },

Minor cleanup

• LocaleProvider is exported from frontend/src/locale/context.tsx but removed from _app.tsx and no longer imported anywhere — can be deleted.
• next-cookies in package.json is now unused (only the removed cookie-sync effect used it).