fix(i18n): persist CMS translations and validate message catalogs

src/i18n/request.ts

@@ -1,41 +1,17 @@
 import { cookies, headers } from "next/headers";
 import { getRequestConfig } from "next-intl/server";
+import { loadCmsMessages } from "@/lib/cms-translations";
 import { mergeMessages } from "./merge-messages";
 
 // i18n WITHOUT routing: the locale is chosen by a `NEXT_LOCALE` cookie, then
 // the Accept-Language header, and finally English as fallback.
-export const SUPPORTED_LOCALES = [
-	"en",
-	"it",
-	"nl",
-	"de",
-	"fr",
-	"es",
-	"pt",
-	"pl",
-	"sv",
-	"tr",
-	"ro",
-	"hu",
-	"cs",
-	"sk",
-	"da",
-	"no",
-	"el",
-	"bg",
-	"hr",
-	"sr",
-	"uk",
-	"ru",
-] as const;
-export type AppLocale = (typeof SUPPORTED_LOCALES)[number];
-export const DEFAULT_LOCALE: AppLocale = "en";
+export {
+	DEFAULT_LOCALE,
+	isSupportedLocale,
+	SUPPORTED_LOCALES,
+} from "./locales";
 
-export function isSupportedLocale(
-	value: string | undefined,
-): value is AppLocale {
-	return !!value && (SUPPORTED_LOCALES as readonly string[]).includes(value);
-}
+import { type AppLocale, DEFAULT_LOCALE, isSupportedLocale } from "./locales";
 
 function detectLocaleFromAcceptLanguage(
 	acceptLanguage: string | null,
@@ -73,14 +49,10 @@ export default getRequestConfig(async () => {
 		locale = detected ?? DEFAULT_LOCALE;
 	}
 
-	// Safe: `locale` is validated against SUPPORTED_LOCALES above (only en/it/nl/de/fr/es).
-	const messages = (await import(`../messages/${locale}.json`)).default;
-	// English is the source of truth; fall back to it for any key missing from a
-	// translation so the UI never shows a raw key path.
-	const fallback =
-		locale === DEFAULT_LOCALE
-			? messages
-			: (await import(`../messages/${DEFAULT_LOCALE}.json`)).default;
+	const [messages, fallback] = await Promise.all([
+		loadCmsMessages(locale),
+		loadCmsMessages(DEFAULT_LOCALE),
+	]);
 
 	return {
 		locale,
@@ -108,6 +80,7 @@ export default getRequestConfig(async () => {
 			if (typeof fromEnglish === "string") return fromEnglish;
 			const seg = key.split(".").pop() ?? key;
 			return seg
+				.replace(/([a-z])([A-Z])/g, "$1 $2")
 				.replace(/[._-]/g, " ")
 				.replace(/\b\w/g, (c) => c.toUpperCase());
 		},