[gnome-sudoku] Use Unicode in translatable strings

[Piotr Drąg <piotrdrag src gnome org>]

commit 267520be0eb7ea8cd4420350eede46d3f2ed204b
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sun Jul 16 01:32:08 2017 +0200

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

 data/org.gnome.sudoku.gschema.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/org.gnome.sudoku.gschema.xml b/data/org.gnome.sudoku.gschema.xml
index ffefc18..f43e02f 100644
--- a/data/org.gnome.sudoku.gschema.xml
+++ b/data/org.gnome.sudoku.gschema.xml
@@ -9,7 +9,7 @@
     <key name="print-multiple-sudoku-difficulty" enum="org.gnome.sudoku.print-multiple-sudoku-difficulty">
       <default>"easy"</default>
       <summary>Difficulty level of sudokus to be printed</summary>
-      <description>Set the difficulty level of the sudokus you want to print. Possible values are - "easy", 
"medium", "hard", "very_hard"</description>
+      <description>Set the difficulty level of the sudokus you want to print. Possible values are: “easy”, 
“medium”, “hard”, “very_hard”</description>
     </key>
     <key name="print-multiple-sudokus-to-print" type="i">
       <default>4</default>