[gimp] Issue #3129: Split sentence on gimpexport.c.

[Jehan <jehanp src gnome org>]

commit 4dcda7ffb8a92ee286ec6828513852ededfa8f7b
Author: Jehan <jehan girinstud io>
Date:   Tue Mar 19 22:26:08 2019 +0100

    Issue #3129: Split sentence on gimpexport.c.

 libgimp/gimpexport.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/libgimp/gimpexport.c b/libgimp/gimpexport.c
index 8cab00e4be..4f87a4ce49 100644
--- a/libgimp/gimpexport.c
+++ b/libgimp/gimpexport.c
@@ -1012,7 +1012,8 @@ gimp_export_dialog_new (const gchar *format_name,
                         const gchar *help_id)
 {
   GtkWidget *dialog;
-  gchar     *title  = g_strconcat (_("Export Image as "), format_name, NULL);
+  /* TRANSLATORS: the %s parameter is an image format name (ex: PNG). */
+  gchar     *title  = g_strdup_printf (_("Export Image as %s"), format_name);
 
   dialog = gimp_dialog_new (title, role,
                             NULL, 0,