Drop concatenated title of remove dialog
    
    As for now the default title of remove dialogs, which are
    initialized from 'association_table' facet, is set to something
    like 'Remove ${other_entity} from ${entity} ${primary_key}',
    where 'other_entity' and 'entity' are also translatable texts.
    This construction is used via method 'show_remove_dialog'
    of 'association_table' widget for the all 'Delete' actions within
    details of entities.
    
    Such concatenation leads to a bad quality translation and
    should be changed to an entire sentence.
    
    From now a mentioned title is taken from a spec and should be
    specified explicitly.
    
    Fixes: https://pagure.io/freeipa/issue/7704
    Reviewed-By: Serhii Tsymbaliuk <stsymbal@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>