[suggestion] Using non-english characters for site redirects

In the process of transferring the site from WordPress to Grav, I had to make redirects from the old URLs to the new ones (`site.yaml`configuration).

I found that English URLs work fine:
````yaml

redirects:
/about: /obo-mne
````
But non-english doesn't work:
```yaml

redirects:
/обо-мне: /obo-mne
```

Apostrophes and quotation marks didn't help, I figured a unicode URL might work:
```yaml
redirects:
/%D0%BE%D0%B1%D0%BE-%D0%BC%D0%BD%D0%B5: /obo-mne
```

It works, [this service](https://r12a.github.io/app-conversion/) helped me a lot.

Part of my redirects table:


Is it possible to add support for this transformation inside the admin panel?

Grav v1.7.34
Admin v1.10.34