[swell-foop] Use Unicode in translatable strings

[Piotr Drąg <piotrdrag src gnome org>]

commit 14116a33578fd1b0cf6e1be64bb72a9b1a2689a0
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Nov 12 13:51:22 2016 +0100

    Use Unicode in translatable strings
    
    See https://developer.gnome.org/hig/stable/typography.html
    
    https://bugzilla.gnome.org/show_bug.cgi?id=772263

 src/swell-foop.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/swell-foop.vala b/src/swell-foop.vala
index dcb4782..9dd8397 100644
--- a/src/swell-foop.vala
+++ b/src/swell-foop.vala
@@ -82,7 +82,7 @@ public class SwellFoop : Gtk.Application
         label = new Gtk.Label (_("Clear as many blocks as you can.\nFewer clicks means more points."));
         label.get_style_context ().add_class ("tip");
         first_vbox.pack_start (label, false);
-        var play_button = new Gtk.Button.with_mnemonic (_("Let's _Play"));
+        var play_button = new Gtk.Button.with_mnemonic (_("Let’s _Play"));
         play_button.get_style_context ().add_class ("play");
         play_button.get_style_context ().add_class ("suggested-action");
         play_button.valign = Gtk.Align.CENTER;