fix: next 10.0.6 changed prerender-manifest for i18n (#163)

Author: lindsaylevine

Diff for: lib/helpers/getPrerenderManifest.js

@@ -14,15 +14,16 @@ const transformManifestForI18n = (manifest) => {
       if (isDynamicRoute) {
         newRoutes[route] = routes[route];
       } else {
-        locales.forEach((locale) => {
-          const routeWithPrependedLocale =
-            route === "/" ? `/${locale}` : `/${locale}${route}`;
-          newRoutes[routeWithPrependedLocale] = {
-            dataRoute: getDataRouteForRoute(route, locale),
-            srcRoute: route,
-            ...params,
-          };
-        });
+        const locale = route.split("/")[1];
+        const routeWithoutLocale = `/${route
+          .split("/")
+          .slice(2, route.split("/").length)
+          .join("/")}`;
+        newRoutes[route] = {
+          dataRoute: getDataRouteForRoute(routeWithoutLocale, locale),
+          srcRoute: routeWithoutLocale,
+          ...params,
+        };
       }
     }
   );