Add initial Portal version

src/i18n/navigation.ts

@@ -0,0 +1,5 @@
+import { createNavigation } from "next-intl/navigation";
+import { routing } from "./routing";
+
+export const { Link, redirect, usePathname, useRouter, getPathname } =
+  createNavigation(routing);

src/i18n/request.ts

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+import { getRequestConfig } from "next-intl/server";
+import { routing } from "./routing";
+
+export default getRequestConfig(async ({ requestLocale }) => {
+  let locale = await requestLocale;
+  if (!locale || !routing.locales.includes(locale as any)) {
+    locale = routing.defaultLocale;
+  }
+
+  return {
+    locale,
+    messages: (await import(`../messages/${locale}.json`)).default,
+  };
+});

src/i18n/routing.ts

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+import { defineRouting } from "next-intl/routing";
+
+export const routing = defineRouting({
+  locales: ["de", "fr", "it", "en"],
+  defaultLocale: "de",
+  localePrefix: "as-needed",
+});