[gtk] Update POTFILES.skip

[Piotr Drąg <piotrdrag src gnome org>]

commit 4494884f9a7d5b80c704c68ac606f99e8e0f10f3
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sun Jun 9 17:29:12 2019 +0200

    Update POTFILES.skip

 po-properties/POTFILES.skip | 1 +
 po/POTFILES.skip            | 1 +
 2 files changed, 2 insertions(+)
---
diff --git a/po-properties/POTFILES.skip b/po-properties/POTFILES.skip
index 4362cb7c5b..c822eacbcd 100644
--- a/po-properties/POTFILES.skip
+++ b/po-properties/POTFILES.skip
@@ -40,6 +40,7 @@ demos/gtk-demo/sizegroup.c
 demos/gtk-demo/spinbutton.ui
 demos/gtk-demo/spinner.c
 demos/gtk-demo/stack.ui
+demos/gtk-demo/themes.ui
 demos/gtk-demo/theming.ui
 demos/icon-browser/menus.ui
 demos/icon-browser/window.ui
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index 319b70671e..b679cdcb34 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -40,6 +40,7 @@ demos/gtk-demo/sizegroup.c
 demos/gtk-demo/spinbutton.ui
 demos/gtk-demo/spinner.c
 demos/gtk-demo/stack.ui
+demos/gtk-demo/themes.ui
 demos/gtk-demo/theming.ui
 demos/icon-browser/menus.ui
 demos/icon-browser/window.ui