Update from Legal for wording to be added near the Terms of Use link on the wikipedia.org portal page and desktop/mobile mocks on how it should look (using the existing colors on the portal page):

This page is available under the Creative Commons Attribution-ShareAlike License.

Link is: http://creativecommons.org/licenses/by-sa/3.0/

Right, so content cleared up then, but that still leaves us with the licensing of the code I guess.

In T135903#2329097, @TheDJ wrote:

Right, so content cleared up then, but that still leaves us with the licensing of the code I guess.

What is content and what is code may be blurry and messed up here, since all of the code was put into the page when it was on Meta, necessitating backwards compatibility with the licence used there. CC BY-SA and GFDL really sucks as a code licence, but we might not have much choice here. :-(

Staying with a Creative Commons license will be fine for the webpage itself, with only simple styling markup and minimal javascript. I'll speak with @debt about the best license for any related code or libraries.

Change 290953 had a related patch set uploaded (by Jdrewniak):
T135902 readme, license and contribution files - README file - CONTRIBUTING file - LICENSE file - CC license on wikipedia.org

https://gerrit.wikimedia.org/r/290953

Change 290953 merged by jenkins-bot:
T135902 readme, license and contribution files - README file - CONTRIBUTING file - LICENSE file - CC license on wikipedia.org

https://gerrit.wikimedia.org/r/290953

This was pushed to production on June 7, 2016