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

[Jamie Guthrie]

@jguthrie100 pushed 2 commits.

5e191e2  Fix rubocop errors
9a25f55  Merge branch 'fix_username_validation' of https://github.com/jguthrie100/openstreetmap-website into fix_username_validation


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/2044/files/4201c14684726a9e3bec37ba678f749e0ec8b95f..9a25f55e6a6f26edc98879e1aaee2aa4e25bcb8f
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