Refactor for i18n, CMS integration, and project slugs; enhance admin & analytics

Co-authored-by: dennis <dennis@konkol.net>

i18n/request.ts

@@ -0,0 +1,16 @@
+import { getRequestConfig } from 'next-intl/server';
+
+export const locales = ['en', 'de'] as const;
+export type AppLocale = (typeof locales)[number];
+
+export default getRequestConfig(async ({ locale }) => {
+  // next-intl can call us with unknown/undefined locales; fall back safely
+  const requested = typeof locale === "string" ? locale : "en";
+  const safeLocale = (locales as readonly string[]).includes(requested) ? requested : "en";
+
+  return {
+    locale: safeLocale,
+    messages: (await import(`../messages/${safeLocale}.json`)).default,
+  };
+});
+