No support for cyrillic suffixes

Hi, I was using numbr.dev, and saw a cool feature: "Use k suffix for thousands"

Here is the problem, I copy some math from my notes where I use cyrillic suffixes and it's not working, so I need to manually replace cyrillic suffixes into engilsh ones

Here is the example:
```
# Cyrillic suffixes
1к+20к+300
```

```
# English suffixes
1k+20k+300
```

Not sure if such suffixes are used in other languages, but it might be cool to add support for them too

What do you thing about this idea? Probably I might implement this and create pull request, if this will be in scope of the project