webui: Add label name to 'Certificates' section
    
    For testing purposes and uniformity, the
    'Certificates' label (located under
    'Active users' settings ) should also have
    'name' attribute, like seen in other parts of the WebUI.
    
    Fixes: https://pagure.io/freeipa/issue/8946
    Signed-off-by: Carla Martinez <carlmart@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Mohammad Rizwan Yusuf <myusuf@redhat.com>