I've raised an issue on the GitHub repository. It looks like the Aiku footer is rendering text rather than HTML. There's no timeline for when this issue will be picked up and fixed. There is a pull request that deals with this issue here.
One option could be to override the footer. There are several tutorials - a bit dated but still applicable. Here is one for Alfresco 4.2. The 'official' tutorial is here.
Digital Community Manager, Alfresco Software. Problem solved? Click Accept as Solution!