[50949589.part1] show interviewers at multi-lines

Also overwrite the default background image for dialog's button bottom panel

Signed-off-by: Henry Chen <hchen@vmware.com>
Merge branch 'master' of https://github.com/vmw-tmpst/heroapp-LetsHire into dialog
Merge pull request #231 from Henry-CF/interviewers

[50949589.part1] show interviewers in multi-lines