Drop concatenated title of add dialog for association_table widget
As for now the default title of add dialogs, which are
initialized from 'association_table' widget, is set to something
like 'Add ${other_entity} into ${entity} ${primary_key}',
where 'other_entity' and 'entity' are also translatable texts.
This construction is used via method 'create_add_dialog' of
'association_table' widget for the all 'Add' 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/7712
Fixes: https://pagure.io/freeipa/issue/7714
Reviewed-By: Serhii Tsymbaliuk <stsymbal@redhat.com>