[gnome-contacts] AboutDialog: Mark the copyright string translatable.

[Niels De Graef <nielsdg src gnome org>]

commit df33e176f6b375203bc025384ef6bd1cdd02402d
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sat Apr 14 19:59:45 2018 +0200

    AboutDialog: Mark the copyright string translatable.
    
    Also prefer the © character instead of writing out "copyright".

 src/contacts-app.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/contacts-app.vala b/src/contacts-app.vala
index 72f8da0..3e3043f 100644
--- a/src/contacts-app.vala
+++ b/src/contacts-app.vala
@@ -183,7 +183,7 @@ public class Contacts.App : Gtk.Application {
                            "program-name", _("GNOME Contacts"),
                            "title", _("About GNOME Contacts"),
                            "comments", _("Contact Management Application"),
-                           "copyright", "Copyright 2011 Red Hat, Inc.\nCopyright 2011-2018 The Contacts 
Developers",
+                           "copyright", _("© 2011 Red Hat, Inc.\n© 2011-2018 The Contacts Developers"),
                            "license-type", Gtk.License.GPL_2_0,
                            "logo-icon-name", "gnome-contacts",
                            "version", Config.PACKAGE_VERSION,