Add title to 'add' dialog for 'Password Policies' entity

To improve translation quality the title of 'Add' dialog should be
specified explicitly in the spec and should be an entire sentence.

Fixes: https://pagure.io/freeipa/issue/7707
Reviewed-By: Serhii Tsymbaliuk <stsymbal@redhat.com>

install/ui/src/freeipa/policy.js

@@ -79,6 +79,7 @@ return {
     ],
     standard_association_facets: true,
     adder_dialog: {
+        title: '@i18n:objects.pwpolicy.add',
         fields: [
             {
                 $type: 'entity_select',

ipaserver/plugins/internal.py

@@ -987,6 +987,7 @@ class i18n_messages(Command):
                 "status_new_s": _("New: key set"),
             },
             "pwpolicy": {
+                "add": _("Add password policy"),
                 "identity": _("Password Policy"),
                 "remove": _("Remove password policies"),
             },