[openstreetmap-website] Add some text and links wrt trademarks to the copyright page (#973)

[simonpoole]

Use conventional styling fur super- and subscripts.

Added some minimal text to the copyright page wrt trademarks, currently
pointing to the LWG, one day it should refer to a formal policy.

LWG and CWG pls review. In particular I personally find the use of the TM superscript a bit ugly, but haven't come up with a better solution yet. 
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/973

-- Commit Summary --

  * Used conventional styling fur super- and subscripts.

-- File Changes --

    M app/assets/stylesheets/common.scss (10)
    M app/views/site/copyright.html.erb (3)
    M config/locales/en.yml (5)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/973.patch
https://github.com/openstreetmap/openstreetmap-website/pull/973.diff

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/973
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