[gnome-photos] properties-dialog: Disambiguate "Title" and "Author" for translation

[Debarshi Ray <debarshir src gnome org>]

commit 9f5e5ab9c1e35a470a1113ce535304143eaa465c
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Jul 22 16:51:28 2013 +0200

    properties-dialog: Disambiguate "Title" and "Author" for translation
    
    This doesn't really affect us at the moment because we have only
    instance of these strings. However, it is good to guard ourselves from
    a future mishap.
    
    Original patch from Cosimo Cecchi for gnome-documents.

 src/photos-properties-dialog.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/photos-properties-dialog.c b/src/photos-properties-dialog.c
index 57cb09d..1986dba 100644
--- a/src/photos-properties-dialog.c
+++ b/src/photos-properties-dialog.c
@@ -155,7 +155,7 @@ photos_properties_dialog_constructed (GObject *object)
   content_area = gtk_dialog_get_content_area (GTK_DIALOG (self));
   gtk_box_pack_start (GTK_BOX (content_area), grid, TRUE, TRUE, 2);
 
-  title = gtk_label_new (_("Title"));
+  title = gtk_label_new (C_("Document Title", "Title"));
   gtk_widget_set_halign (title, GTK_ALIGN_END);
   context = gtk_widget_get_style_context (title);
   gtk_style_context_add_class (context, "dim-label");
@@ -164,7 +164,7 @@ photos_properties_dialog_constructed (GObject *object)
   author = photos_base_item_get_author (item);
   if (author != NULL && author[0] != '\0')
     {
-      author_w = gtk_label_new (_("Author"));
+      author_w = gtk_label_new (C_("Document Author", "Author"));
       gtk_widget_set_halign (author_w, GTK_ALIGN_END);
       context = gtk_widget_get_style_context (author_w);
       gtk_style_context_add_class (context, "dim-label");