Add title to remove dialog of 'Hosts' 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>

install/ui/src/freeipa/host.js

@@ -477,6 +477,7 @@ return {
         ]
     },
     deleter_dialog: {
+        title: '@i18n:objects.host.remove',
         $factory: IPA.host_deleter_dialog
     }
 };};

ipaserver/plugins/internal.py

@@ -659,6 +659,7 @@ class i18n_messages(Command):
                 "password_set_button": _("Set OTP"),
                 "password_set_success": _("OTP set"),
                 "password_set_title": _("Set One-Time-Password"),
+                "remove": _("Remove hosts"),
                 "status": _("Status"),
                 "unprovision": _("Unprovision"),
                 "unprovision_confirmation": _("Are you sure you want to unprovision this host?"),