Bug 899837 - Always display thanks on /updated page

Always display "Thank you for updating your email preferences"
at the top of the /newsletter/updated/ page.
Fix bug 790784: Port Websites Privacy Policy
Merge pull request #933 from openjck/790784-websites-privacy

Fix bug 790784: Port Websites Privacy Policy
Merge pull request #1121 from dpoirier/bug-899837-updated-thanks

Bug 899837 - Always display thanks on /updated page