[openstreetmap/openstreetmap-website] Specifiy invalid chars in username error message (#2044)

[Tom Hughes]

They're not ASCII chars anyway, they're unicode code points ;-)

Note that the first group is the ones which have special meaning in URLs and are hence banned in fields which might become part of a URL while the second group are (or should be) just banned everywhere.

So I would tend to make the names more like `INVALID_URL_CHARACTERS` and `INVALID_CHARACTERS` rather than what you have now (technically characters is wrong but it will make more sense to a casual reader).

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