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

[Tom Hughes]

@tomhughes pushed 1 commit.

873ac15  Improve consistency of text validations


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/2044/files/1e57189366c0e4a49cb29658e9bf5985996709a2..873ac155cabfb1aab8d887d07bc8389617d3f843
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