Fix runtime default locale resolution

app/[locale]/(site)/success/page.tsx

@@ -8,7 +8,7 @@ import { MotionFade } from "@/components/motion-fade";
 import { HeroShell, HeroTitle } from "@/components/layout/site-hero";
 import { getSiteSettings } from "@/lib/app-config";
 import { buildLocalizedMetadata } from "@/lib/metadata";
-import { getLocalizedPath, resolveLocale } from "@/lib/locale";
+import { FALLBACK_LOCALE, getLocalizedPath, resolveLocale } from "@/lib/locale";
 import { AppCard } from "@/components/ui/app-card";
 import { Button } from "@/components/ui/button";
 import { CardContent } from "@/components/ui/card";
@@ -21,7 +21,7 @@ type SuccessPageProps = {
 
 export async function generateMetadata({ params }: SuccessPageProps): Promise<Metadata> {
   const { locale } = await params;
-  const localeKey = resolveLocale(locale);
+  const localeKey = resolveLocale(locale, FALLBACK_LOCALE);
   const t = await getTranslations({ locale: localeKey, namespace: "successPage" });
 
   return await buildLocalizedMetadata({
@@ -34,7 +34,7 @@ export async function generateMetadata({ params }: SuccessPageProps): Promise<Me
 
 export default async function SuccessPage({ params }: SuccessPageProps) {
   const { locale } = await params;
-  const localeKey = resolveLocale(locale);
+  const localeKey = resolveLocale(locale, FALLBACK_LOCALE);
   const [t, siteSettings] = await Promise.all([
     getTranslations({ locale: localeKey, namespace: "successPage" }),
     getSiteSettings(),