GUI: added {validationLinkCustom} to help for notifications
Merge pull request #528 from zlamalp/custom

GUI: added {validationLinkCustom} to help for notifications
GUI: better display of user's name from cert DN

- Display readable CN from cert DN if user is unknown
  and on submitted applications page.
Merge pull request #529 from zlamalp/cert

GUI: better display of user's name from cert DN