Also use HTTPs for footer link

Author: dijitali

src/locales/en.json

@@ -253,7 +253,7 @@
       "call": "Help us keep Internet free and open."
     },
     "licensing": {
-      "text": "<p>Except where otherwise <a href=\"https://creativecommons.org/policies#license\">noted</a>, content on this site is licensed under a <a href=\"http://creativecommons.org/licenses/by/4.0/\">Creative Commons Attribution 4.0 International license</a>. Icons by <a href=\"https://creativecommons.org/website-icons\">Noun Project</a>.</p>"
+      "text": "<p>Except where otherwise <a href=\"https://creativecommons.org/policies#license\">noted</a>, content on this site is licensed under a <a href=\"https://creativecommons.org/licenses/by/4.0/\">Creative Commons Attribution 4.0 International license</a>. Icons by <a href=\"https://creativecommons.org/website-icons\">Noun Project</a>.</p>"
     },
     "contribute": "<p>Contribute on <a href=\"https://github.com/creativecommons/chooser\">Github</a>.</p>"
   },