[iagno] Add translator hint for how to translate "ply".

[Arnaud B. <arnaudb src gnome org>]

commit 8f1eca67454cd6969dbc4e6a9c75ab6dab088abc
Author: Arnaud B <arnaud bonatti gmail com>
Date:   Fri Sep 6 15:18:04 2019 +0000

    Add translator hint for how to translate "ply".
    
    As discussed on #11.

 data/org.gnome.Reversi.gschema.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/org.gnome.Reversi.gschema.xml b/data/org.gnome.Reversi.gschema.xml
index d677924..d46c30d 100644
--- a/data/org.gnome.Reversi.gschema.xml
+++ b/data/org.gnome.Reversi.gschema.xml
@@ -66,7 +66,7 @@
       <default>false</default>
       <!-- Translators: summary of a settings key, see 'dconf-editor 
/org/gnome/iagno/highlight-turnable-tiles' -->
       <summary>A flag to highlight turnable tiles</summary>
-      <!-- Translators: description of a settings key, see 'dconf-editor 
/org/gnome/iagno/highlight-turnable-tiles' -->
+      <!-- Translators: description of a settings key, see 'dconf-editor 
/org/gnome/iagno/highlight-turnable-tiles'; a "ply" here means a "play", a "move": the player moves mouse 
cursor and sees what he can capture by playing there -->
       <description>If “true”, the tiles that will be captured to the opponent by a ply are 
highlighted.</description>
     </key>
     <key name="theme" type="s">