File upload widget does not provide helpful error messages to user

[m6121]

Description / Beschreibung

Error messages for non-successful file uploads in catalogs are not displayed to the user.

Expected behaviour / Erwartetes Verhalten

Show returned error message, .e.g. "Request Entity Too Large" or "Project file quota exceeded" etc.

Steps to reproduce / Schritte zum Reproduzieren

1. Create project with file upload widget
2. Upload large file that is larger than file quota or web server config
3. Error message shows "Ein unbekannter Fehler ist aufgetreten, bitte kontaktieren Sie den Support"

Context / Kontext

RDMO v2.4.0+