[openstreetmap/openstreetmap-website] Use CanCanCan for user_roles auth (#2078)

[Andy Allan]

This refactors another controller to use CanCanCan, and removes some custom code for requiring administrators.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2078

-- Commit Summary --

  * Use CanCanCan for user_roles auth

-- File Changes --

    M app/abilities/ability.rb (1)
    M app/controllers/user_roles_controller.rb (15)
    M config/locales/en.yml (1)
    M test/abilities/abilities_test.rb (24)
    M test/controllers/user_roles_controller_test.rb (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2078.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2078.diff

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