[gtk+] Fix CSS spelling in a translatable string

[Piotr Drąg <piotrdrag src gnome org>]

commit e47bd31e6ada68585a8c31d50791add42bf07ae6
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Fri Jan 20 23:46:38 2017 +0100

    Fix CSS spelling in a translatable string

 gtk/gtkwidget.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index e46bcce..eb234bc 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -1496,7 +1496,7 @@ gtk_widget_class_init (GtkWidgetClass *klass)
   widget_props[PROP_CSS_NAME] =
       g_param_spec_string ("css-name",
                            P_("CSS Name"),
-                           P_("The name of this widget in the css tree"),
+                           P_("The name of this widget in the CSS tree"),
                            NULL,
                            GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);