Ticket #47467 - Improve Add CRL/CKL dialog and errors
    
    Description: Additional modifications to the error messages.
    When an input for CRL/CKL is missing, the generated error message
    is not broken and does not give much help.
      DBT_MISSING_THIS + DBT_MISSING_FILE
      You should enter a No file specified.  Enter the full path of a file.'
    If the object of the "enter" is DBT_MISSING_FILE, change to just print
    it.  And modified the sentense as follows:
      Enter a file name in the configuration directory or the full path of
      a file.
    
    https://fedorahosted.org/389/ticket/47467
    
    Reviewed by rmeggins@redhat.com (Thank you, Rich!!)