[openstreetmap-website] Fix for #436 (#437)

[John Firebaugh]

You can merge this Pull Request by running:

  git pull https://github.com/jfirebaugh/openstreetmap-website 436

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/437

-- Commit Summary --

  * Add a hash if one isn't already present
  * Preserve location hash in referer

-- File Changes --

    M app/views/site/id.html.erb (2)
    M app/views/user/login.html.erb (5)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/437.patch
https://github.com/openstreetmap/openstreetmap-website/pull/437.diff

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