[openstreetmap/openstreetmap-website] Unicode limitation for usernames (#3266)

[Nukeador]

Hi there,

As part of the Community Discourse set up @Firefishy is leading, a question about unicode characters on usernames has been discussed and I was asked by @mmd-osm to bring this question here for guidance.

Discourse limits the characters on usernames to letters and numbers, but apparently we are getting usernames with unicode chars through the oauth2 connection.

We can enable unicode usernames over Discourse and we can also limit the allowed unicode characters, I suspect to avoid issues with invisible characters and confusing icons on the UI that might trick users:

![imagen](https://user-images.githubusercontent.com/531906/126550214-49b498ae-8223-4df7-9c1a-0b43d7ab8445.png)

What is the current unicode characters policy on OSM usernames? Is there an allowed list we can use too?

Thanks!

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