Special characters are not escaped on upload

## 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: