[gnome-contacts] Window: reinstate ngettext() for delete notification.

[Niels De Graef <nielsdg src gnome org>]

commit a57acdd03799d64b15a2126369f0379dd0d25745
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Mon Jan 22 17:47:42 2018 +0100

    Window: reinstate ngettext() for delete notification.
    
    Kudos to Piotr Drąg for spotting this so quickly.

 src/contacts-window.vala |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/contacts-window.vala b/src/contacts-window.vala
index f273003..f858630 100644
--- a/src/contacts-window.vala
+++ b/src/contacts-window.vala
@@ -315,8 +315,9 @@ public class Contacts.Window : Gtk.ApplicationWindow {
     set_shown_contact (null);
     this.state = UiState.NORMAL;
 
-    var msg = (contacts.size > 1)? _("%d contacts deleted").printf (contacts.size)
-                                 : _("Deleted contact %s").printf (contacts[0].individual.display_name);
+    var msg = ngettext (_("Deleted contact %s").printf (contacts[0].individual.display_name),
+                        _("%d contacts deleted").printf (contacts.size),
+                        contacts.size);
 
     var b = new Button.with_mnemonic (_("_Undo"));