First commit

frontend/i18n/i18n.config.ts

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+/* Vue I18n options for the wiki's interface text. The locale list, the
+   message files and the detection (cookie `mathew-locale`) are configured
+   in nuxt.config.ts under `i18n`. */
+export default defineI18nConfig(() => ({
+  legacy: false,
+  // An untranslated key falls back to English rather than echoing itself.
+  fallbackLocale: 'en',
+}))