1802: Downgrade next-intl version

Author: Ruben van Leeuwen

frontend/package-lock.json

@@ -59,7 +59,7 @@
         "dayjs": "^1.11.13",
         "i18next": "^24.1.2",
         "lodash": "^4.17.21",
-        "next-intl": "^4.0.2",
+        "next-intl": "^3.26.5",
         "react-hook-form": "^7.54.1",
         "swr": "^2.3.0",
         "zod": "^3.24.1",