[openstreetmap-website] Usernames are not XML-char safe (#759)

[Tom Hughes]

I've excluded the basic ASCII control characters in 32c385e8d7dd55194de1904462afc73b38a1542e.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/759#issuecomment-46118906
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