fix(i18n): complete command center texts and merge client fallbacks

src/i18n/request.ts

@@ -1,5 +1,6 @@
 import { cookies, headers } from "next/headers";
 import { getRequestConfig } from "next-intl/server";
+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.
@@ -83,11 +84,19 @@ export default getRequestConfig(async () => {
 
 	return {
 		locale,
-		messages,
+		messages: mergeMessages(fallback, messages),
 		// Never throw on a missing message — use the English value, or a humanised
 		// key as a last resort.
-		getMessageFallback({ key }: { key: string }) {
-			const fromEnglish = key
+		getMessageFallback({
+			namespace,
+			key,
+		}: {
+			namespace?: string;
+			key: string;
+		}) {
+			const fromEnglish = [namespace, key]
+				.filter(Boolean)
+				.join(".")
 				.split(".")
 				.reduce<unknown>(
 					(o, k) =>