[gnome-chess] Add translator comments for en passant captures

[Michael Catanzaro <mcatanzaro src gnome org>]

commit ef1fe371bba1a5b56b7920e7f0ea8cea2625b296
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Fri Dec 4 15:44:57 2020 -0600

    Add translator comments for en passant captures

 src/gnome-chess.vala | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index 07f0d4f..e249a03 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -1266,8 +1266,10 @@ Copyright © 2015–2016 Sahil Sareen""";
                  game.current_state.last_move.en_passant)
         {
             if (game.current_player.color == Color.WHITE)
+                /* Window title when Black captures White's pawn en passant */
                 headerbar.set_title (_("Black captured en passant"));
             else
+                /* Window title when White captures Black's pawn en passant */
                 headerbar.set_title (_("White captured en passant"));
         }
         else if (game.current_player.color == Color.WHITE)