(bugs 67678 & 67679) Links to user & user talk don't color blue/red properly

Links to user are currently always displayed blue, links to talk always red.
They should check if the pages really exist and display blue if yes, red if not.

Bug: 67678
Bug: 67679
Change-Id: Ie414eed669fff6fc37e7755ce2581cc8c3753949
Merge "(bugs 67678 & 67679) Links to user & user talk don't color blue/red properly"