Add title to remove dialog of 'SELinux User Maps' entity
    
    To improve translation quality the title of Remove dialog
    should be specified explicitly in the spec and should be an
    entire sentence.
    
    Fixes: https://pagure.io/freeipa/issue/7699
    Reviewed-By: Serhii Tsymbaliuk <stsymbal@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>