[gnome-boxes] Use Unicode in a new translatable string

[Piotr Drąg <piotrdrag src gnome org>]

commit e2aa7ac87103d7ba4b31c43aa11a3871a097c1f1
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Mon Jan 30 16:30:50 2017 +0100

    Use Unicode in a new translatable string
    
    See https://developer.gnome.org/hig/stable/typography.html
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774280

 src/unattended-setup-box.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/unattended-setup-box.vala b/src/unattended-setup-box.vala
index 61d70a8..1ecfc08 100644
--- a/src/unattended-setup-box.vala
+++ b/src/unattended-setup-box.vala
@@ -209,7 +209,7 @@ private class Boxes.UnattendedSetupBox : Gtk.Box {
             var credentials_variant = variant_builder.end ();
             var credentials_str = credentials_variant.print (true);
 
-            var label = _("GNOME Boxes credentials for '%s'").printf (media_path);
+            var label = _("GNOME Boxes credentials for “%s”").printf (media_path);
             Secret.password_store.begin (secret_password_schema,
                                          Secret.COLLECTION_DEFAULT,
                                          label,