ChangeScreen2: Fix CSS style of Show/Ignore actions

The CSS rule needs to be 'a.class' to get enough priority to override
the default rules being inherited from the page. Without this the
links aren't rendered with the correct color.

The links should be underline all of the time to indicate they are
clickable, but the default page rules disable underline. Fix this
by turning back on underline.

Add href attributes using javascript; as the link target. Without
this the browser does not know these are actions and styles them
as plain text.

Add title attributes to hide the javascript; when the user does
a mouse hover over the link.

Change-Id: I9af87380d0e2bd5c84f39c5617a7986987f6714c