Feature Request: Better error message if delete a not empty folder

[BenRoe]

Is your feature request related to a problem? Please describe.
If i try to delete a not empty folder in "Content" overview, i get the following error.

ERROR|handler_api.c:2267:handleApiFileDelete| Error deleting file '/9BD07122' -> '/teddycloud/data/content/default/9BD07122', error Generic error code [1]

First i thought it's a file owner problem.
Someone on the Telegram channel noted, that recursive delete is disabled by default.
The error message above does not explain that.

Describe the solution you'd like
Mention that in the error message, that the folder is not empty.

Describe alternatives you've considered
Allow recursive deletion.

[SciLor]

The frontend should not allow the deletion of folders, that are not empty

[henryk86]

Folders should be deletable. This should be not restricted.