[gthumb] mark a string for translation

[Paolo Bacchilega <paobac src gnome org>]

commit 653f12c5457bf9156ceddb330e82ec4a12d27ae2
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Tue Aug 16 12:16:05 2016 +0200

    mark a string for translation

 gthumb/gth-file-chooser-dialog.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gthumb/gth-file-chooser-dialog.c b/gthumb/gth-file-chooser-dialog.c
index 1ada9ee..5ecd112 100644
--- a/gthumb/gth-file-chooser-dialog.c
+++ b/gthumb/gth-file-chooser-dialog.c
@@ -191,7 +191,7 @@ gth_file_chooser_dialog_construct (GthFileChooserDialog *self,
 
        settings = g_settings_new (GTHUMB_SAVE_FILE_SCHEMA);
 
-       self->priv->options_checkbutton = gtk_check_button_new_with_mnemonic ("_Show Format Options");
+       self->priv->options_checkbutton = gtk_check_button_new_with_mnemonic (_("_Show Format Options"));
        gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (self->priv->options_checkbutton), 
g_settings_get_boolean (settings, PREF_SAVE_FILE_SHOW_OPTIONS));
        gtk_widget_show (self->priv->options_checkbutton);
        gtk_file_chooser_set_extra_widget (GTK_FILE_CHOOSER (self), self->priv->options_checkbutton);