Add admin site settings sections and locale defaults

lib/locale.ts

@@ -29,11 +29,19 @@ export function stripLocalePrefix(pathname: string): string {
 }
 
 export function getLocalizedPath(locale: string, pathname = "/"): string {
+  return getLocalizedPathWithDefault(locale, pathname, routing.defaultLocale);
+}
+
+export function getLocalizedPathWithDefault(
+  locale: string,
+  pathname = "/",
+  defaultLocale: AppLocale = routing.defaultLocale,
+): string {
   const localeKey = resolveLocale(locale);
   const normalizedPath = pathname === "" ? "/" : pathname;
   const strippedPath = stripLocalePrefix(normalizedPath);
 
-  if (localeKey === routing.defaultLocale) {
+  if (localeKey === defaultLocale) {
     return strippedPath;
   }