userportal, webadmin: rename feedback link label property

Refactor: rename feedback_message to feedback_link_label to
correspond with the other links in the application.

Refactor: move feedback link click handler from constructor to
onBind to correspond with the other click handlers.

Change-Id: I0890f86afa235f32da7ebb014a1385349535dfbd
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>