[gtk] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit df74f363280485b25160bfc87a09c34a33b77815
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Apr 5 17:37:22 2018 +0200

    Update POTFILES.in

 po-properties/POTFILES.in | 1 +
 po/POTFILES.in            | 1 +
 2 files changed, 2 insertions(+)
---
diff --git a/po-properties/POTFILES.in b/po-properties/POTFILES.in
index fd392bfe67..14d0eca7d5 100644
--- a/po-properties/POTFILES.in
+++ b/po-properties/POTFILES.in
@@ -297,6 +297,7 @@ gtk/gtkvideo.c
 gtk/gtkviewport.c
 gtk/gtkvolumebutton.c
 gtk/gtkwidget.c
+gtk/gtkwidgetpaintable.c
 gtk/gtkwindow.c
 gtk/inspector/action-editor.c
 gtk/inspector/css-editor.c
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 71d55d5c95..f3f97c2fa5 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -300,6 +300,7 @@ gtk/gtkvideo.c
 gtk/gtkviewport.c
 gtk/gtkvolumebutton.c
 gtk/gtkwidget.c
+gtk/gtkwidgetpaintable.c
 gtk/gtkwindow.c
 gtk/inspector/action-editor.c
 gtk/inspector/actions.ui