WebUI: change FreeIPA naming to IPA in About dialog
    
    As part of the effort for reducing differences between
    upstream and downstream releases, product naming in WebUI
    About dialog is changed from FreeIPA to IPA.
    
    Related: https://pagure.io/freeipa/issue/8669
    Signed-off-by: Antonio Torres <antorres@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>