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

[Jamie Guthrie]

Fixes #157

I've extracted out the regex list of invalid characters to a constant (to avoid errors in duplication) and added a locale translation. This should make the error message a lot more helpful!
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2044

-- Commit Summary --

  * Specifiy invalid chars in username error message

-- File Changes --

    M app/models/user.rb (7)
    M config/locales/en.yml (1)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2044.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2044.diff

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