Remove bits of RDFa which were commented out because of invalid HTML.

As part of my work of switching our html validation over to validator.nu, I am finding various bits of RDFa which are just plain invalid html. I have fixed these where I can, but where I cannot I have commented out the RDFa code and will reference this ticket in the code. A "git grep MBS-5244" should find all cases where this has happened.