feat(i18n): implement translation basis

i18n/navigation.ts

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

i18n/request.ts

@@ -0,0 +1,15 @@
+import {getRequestConfig} from 'next-intl/server';
+import {hasLocale} from 'next-intl';
+import {routing} from './routing';
+ 
+export default getRequestConfig(async ({requestLocale}) => {
+  const requested = await requestLocale;
+  const locale = hasLocale(routing.locales, requested)
+    ? requested
+    : routing.defaultLocale;
+ 
+  return {
+    locale,
+    messages: (await import(`../messages/${locale}.json`)).default,
+  };
+});

i18n/routing.ts

@@ -0,0 +1,7 @@
+import { defineRouting } from "next-intl/routing";
+
+export const routing = defineRouting({
+  locales: ["de", "en"],
+  defaultLocale: "de",
+  localePrefix: "as-needed",
+});