[openstreetmap-website] Use uniform abbreviations for CC licenses (#501)

[Paul Norman]

We have both "CC-BY" and "CC BY" on the copyright page. Creative Commmons itself uses the CC BY or CC BY-SA form.
You can merge this Pull Request by running:

  git pull https://github.com/pnorman/openstreetmap-website patch-2

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

  https://github.com/openstreetmap/openstreetmap-website/pull/501

-- Commit Summary --

  * Use uniform abbreviations for CC licenses

-- File Changes --

    M config/locales/en.yml (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/501.patch
https://github.com/openstreetmap/openstreetmap-website/pull/501.diff
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