[gnome-photos] export-notification: Add a requested translator comment

[Debarshi Ray <debarshir src gnome org>]

commit 1d6d1eae01b2cbba8255f53714acdb65b08fe6b5
Author: Debarshi Ray <debarshir gnome org>
Date:   Sat Mar 5 19:00:59 2016 +0100

    export-notification: Add a requested translator comment
    
    https://bugzilla.gnome.org/show_bug.cgi?id=763133

 src/photos-export-notification.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-export-notification.c b/src/photos-export-notification.c
index 8b8f712..507e5bc 100644
--- a/src/photos-export-notification.c
+++ b/src/photos-export-notification.c
@@ -299,6 +299,9 @@ photos_export_notification_constructed (GObject *object)
           g_signal_connect_swapped (open, "clicked", G_CALLBACK (photos_export_notification_open), self);
         }
 
+      /* Translators: this is the label of the button to open the
+       * folder where the item was exported.
+       */
       export_folder = gtk_button_new_with_label (_("Export Folder"));
       gtk_widget_set_valign (export_folder, GTK_ALIGN_CENTER);
       gtk_container_add (GTK_CONTAINER (self), export_folder);