[libegg] Add a translator comment

[Philip Withnall <pwithnall src gnome org>]

commit 33a2f514e88e314c921e4dd5f19d784600795a23
Author: Philip Withnall <philip tecnocode co uk>
Date:   Mon Aug 9 22:09:37 2010 +0100

    Add a translator comment

 libegg/fileformatchooser/eggfileformatchooser.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/libegg/fileformatchooser/eggfileformatchooser.c b/libegg/fileformatchooser/eggfileformatchooser.c
index 4c691c9..bbbc720 100644
--- a/libegg/fileformatchooser/eggfileformatchooser.c
+++ b/libegg/fileformatchooser/eggfileformatchooser.c
@@ -648,6 +648,7 @@ chooser_response_cb (GtkDialog *dialog,
         {
 
           message = g_strdup_printf (
+            /* Translators: the parameter is a filename */
             _("The program was not able to find out the file format "
               "you want to use for `%s'. Please make sure to use a "
               "known extension for that file or manually choose a "