Remove i18n, keep only Italian and rely on browser translation

The interface was translated in en/it/es/fr via @nuxtjs/i18n. Drop the
module, the locale files, and the language switcher: the UI is now
static Italian text, with translation for foreign visitors left to the
Google Translate browser extension instead of the app.

frontend/nuxt.config.ts

@@ -5,12 +5,11 @@ export default defineNuxtConfig({
   compatibilityDate: '2025-07-15',
   devtools: { enabled: true },
 
-  modules: ['@nuxtjs/i18n'],
-
   css: ['~/assets/css/main.css'],
 
   app: {
     head: {
+      htmlAttrs: { lang: 'it' },
       titleTemplate: `%s · ${SITE_NAME}`,
       meta: [{ name: 'viewport', content: 'width=device-width, initial-scale=1' }],
       link: [
@@ -20,27 +19,6 @@ export default defineNuxtConfig({
     },
   },
 
-  i18n: {
-    // English keeps the bare URLs; the others are prefixed (/it/blog, /es/blog…).
-    defaultLocale: 'en',
-    strategy: 'prefix_except_default',
-    locales: [
-      { code: 'en', language: 'en-GB', name: 'English', file: 'en.json' },
-      { code: 'it', language: 'it-IT', name: 'Italiano', file: 'it.json' },
-      { code: 'es', language: 'es-ES', name: 'Español', file: 'es.json' },
-      { code: 'fr', language: 'fr-FR', name: 'Français', file: 'fr.json' },
-    ],
-    // First visit follows the browser language; after that the cookie wins.
-    detectBrowserLanguage: {
-      useCookie: true,
-      cookieKey: 'locale',
-      redirectOn: 'root',
-    },
-    // Overridden per environment with NUXT_PUBLIC_I18N_BASE_URL, so the
-    // alternate-language links are absolute and correct in production.
-    baseUrl: 'http://localhost:3000',
-  },
-
   runtimeConfig: {
     // Server-only: internal Strapi address, never exposed to the browser.
     strapiUrl: 'http://localhost:1337',