Corporate info pages fix and additition

While pairing with Graham on a story regarding custom logos for orgs
I noticed that the wales office translations werer broken on corporate info pages.
Also, I added a back to homepage 'Org name homepage' link to corporate info pages to reflect the changes made on the about page.
Merge pull request #831 from alphagov/corporate-pages-fixe-and-addition

Corporate info pages fix and additition