[gnome-chess] Improve stalemate message

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 929ad02976e0e871203e0ec9a2023708018bc71e
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Thu Dec 24 10:57:23 2020 -0600

    Improve stalemate message
    
    Saying "opponent cannot move" is confusing if the human player is
    stalemated.

 src/gnome-chess.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index 4f282d6..19e391f 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -1461,7 +1461,7 @@ Copyright © 2015–2016 Sahil Sareen""";
             break;
         case ChessRule.STALEMATE:
             /* Game status when the game terminates due to a stalemate */
-            why = _("Opponent cannot move.");
+            why = _("Player cannot move.");
             break;
         case ChessRule.FIFTY_MOVES:
             /* Game status when the game is drawn due to the fifty move rule */