[gnome-contacts] Window: do the ngettext thing properly this time.

[Niels De Graef <nielsdg src gnome org>]

commit 81e63b25bb073d26cbb0a0573ca5e9bf880e47bf
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Mon Jan 22 17:57:49 2018 +0100

    Window: do the ngettext thing properly this time.
    
    Again, big thanks to Piotr Drąg for his feedback.

 src/contacts-window.vala |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/src/contacts-window.vala b/src/contacts-window.vala
index f858630..0885108 100644
--- a/src/contacts-window.vala
+++ b/src/contacts-window.vala
@@ -315,9 +315,12 @@ public class Contacts.Window : Gtk.ApplicationWindow {
     set_shown_contact (null);
     this.state = UiState.NORMAL;
 
-    var msg = ngettext (_("Deleted contact %s").printf (contacts[0].individual.display_name),
-                        _("%d contacts deleted").printf (contacts.size),
-                        contacts.size);
+    string msg;
+    if (contacts.size == 1)
+      msg = _("Deleted contact %s").printf (contacts[0].individual.display_name);
+    else
+      msg = ngettext (_("%d contact deleted"), _("%d contacts deleted"), contacts.size)
+              .printf (contacts.size);
 
     var b = new Button.with_mnemonic (_("_Undo"));