[iagno] Update title on back.

[Arnaud B. <arnaudb src gnome org>]

commit 8c30dc8ec0ad5ee564ec998d97138d959431499f
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Thu Dec 5 23:44:27 2019 +0100

    Update title on back.

 src/iagno.vala | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)
---
diff --git a/src/iagno.vala b/src/iagno.vala
index 0d3c09c..756aca3 100644
--- a/src/iagno.vala
+++ b/src/iagno.vala
@@ -613,6 +613,7 @@ private class Iagno : Gtk.Application, BaseApplication
     private void back_cb ()
         requires (game_is_set)
     {
+        set_window_title (game.reverse);
         if (game.current_color != player_one && computer != null && !game.is_complete)
             ((!) computer).move (SLOW_MOVE_DELAY);
         else if (game.is_complete)
@@ -667,11 +668,7 @@ private class Iagno : Gtk.Application, BaseApplication
             opening = Opening.REVERSI;
 
         bool reverse = settings.get_string ("type") == "reverse";
-        /* Translators: name of one of the games, as displayed in the headerbar when playing */
-        window.set_title (reverse ? _("Reverse Reversi")
-
-        /* Translators: name of one of the games, as displayed in the headerbar when playing */
-                                  : _("Classic Reversi"));
+        set_window_title (reverse);
         game = new Game (reverse, opening, (uint8) size /* 4 <= size <= 16 */, print_logs);
         game_is_set = true;
         game.turn_ended.connect (turn_ended_cb);
@@ -878,6 +875,15 @@ private class Iagno : Gtk.Application, BaseApplication
         window.set_history_button_label (game.current_color);
     }
 
+    private void set_window_title (bool reverse)
+    {
+        /* Translators: name of one of the games, as displayed in the headerbar when playing */
+        window.set_title (reverse ? _("Reverse Reversi")
+
+        /* Translators: name of one of the games, as displayed in the headerbar when playing */
+                                  : _("Classic Reversi"));
+    }
+
     /*\
     * * Sound
     \*/