Special characters are not escaped on upload

[sladg]

Describe the bug

When uploading, I'm allowed to upload with non UTF-8 characters. However, when I want to view / download it, I get error 500.

Steps to reproduce

1. Use aws s3 sync s3://my-bucket ./folder which includes escaped names such as (5_Pavel+Kub%C3%AD%7Fek.pdf or X+19-20/6_Mark%C3%A9ta+Dosoudilov%C3%A1+-+jedin%7F+v%7Fjezd+2020+(k+%7Fervnu).pdf),
2. Upload folder into OCIS via WebUI - Folder upload,
3. Try to view the file.

Expected behaviour

Either disallow user to upload such file or sanitise names on upload.

Actual behaviour

File is uploaded keeping its name, however, cannot be viewed.

Additional context

File can be renamed and it starts working then. However, name editor is acting strange when rendering non-compliant characters.

ownCloud v10 has also trouble rendering such characters, however, it allows for displaying them without issue.

OCIS:

ownCloud 10:

[sladg]

Related to #8650