fix: use dynamic recipeLang in API calls instead of hardcoded /api/rezepte

Client-side navigation to /recipes hung because getUserFavorites and
other endpoints were hardcoded to /api/rezepte, causing fetch mismatches
during SvelteKit's client-side routing.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.4.2",
+	"version": "1.4.3",
 	"private": true,
 	"type": "module",
 	"scripts": {