[gcompris] Fix a typo in submarine.c

[Gabor Keleman <kelemeng src gnome org>]

commit c718a5d0ac33ab8115e0004daf0081296114df9f
Author: Gabor Kelemen <kelemeng gnome hu>
Date:   Thu Dec 25 02:10:14 2014 +0100

    Fix a typo in submarine.c

 src/submarine-activity/submarine.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/submarine-activity/submarine.c b/src/submarine-activity/submarine.c
index 9aba936..8768a18 100644
--- a/src/submarine-activity/submarine.c
+++ b/src/submarine-activity/submarine.c
@@ -558,7 +558,7 @@ static GooCanvasItem *submarine_create_item(GooCanvasItem *parent) {
 
   gchar *ballast_flush_str = \
     g_strconcat( "\n\n",
-                _("Open or close the the ballast flush."), "\n",
+                _("Open or close the ballast flush."), "\n",
                 _("It flushes the water out of the tank."), "\n",
                 _("Increase the water level to dive."), "\n",
                 _("Lower the water level to surface."), NULL );