[gtranslator] Remove translation for empty string

[Daniel Garcia Moreno <danigm src gnome org>]

commit 8b3e2f4114584501a74dc2da53f671e42db84d50
Author: Daniel García Moreno <danigm wadobo com>
Date:   Mon Sep 10 19:55:52 2018 +0200

    Remove translation for empty string

 src/gtr-window.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/gtr-window.c b/src/gtr-window.c
index 130a176b..d1787beb 100644
--- a/src/gtr-window.c
+++ b/src/gtr-window.c
@@ -282,7 +282,7 @@ set_window_title (GtrWindow * window, gboolean with_path)
   else
     {
       title = g_strdup (_("gtranslator"));
-      subtitle = g_strdup (_(""));
+      subtitle = g_strdup ("");
     }
 
   gtk_window_set_title (GTK_WINDOW (window), title);