[gnome-sudoku] Partially revert "Use Unicode in translatable strings"

[Piotr Drąg <piotrdrag src gnome org>]

commit 0cc3b05f14009f35be52a96da1fe4663082f606b
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sun Jul 16 01:35:03 2017 +0200

    Partially revert "Use Unicode in translatable strings"
    
    This partially reverts commit 267520be0eb7ea8cd4420350eede46d3f2ed204b.
    
    The ASCII apostrophes are actually part of the syntax.

 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 f43e02f..5560be9 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>