Update wdtk-routes.rb to add redirects for cymru, scotland, and wales
Update wdtk-routes.rb to add redirects for cymru, scotland, and wales

Based on #417 - adds redirects for cymru, scotland, and wales to
appropriate tags.

For /cymru we should ensure that we are presenting the page in Welsh. We
can do that by referencing the locale within the URL.

mysociety/whatdotheyknow-theme,mysociety/whatdotheyknow-theme,mysociety/whatdotheyknow-theme