[glade] Add missing file to POTFILES

[Corentin Noël <corentinnoel src gnome org>]

commit 4f3262627d2db069bc136d8802df9928b638e282
Author: Corentin Noël <corentin noel collabora com>
Date:   Fri Oct 4 17:19:22 2019 +0200

    Add missing file to POTFILES

 po/POTFILES.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index c9d130cc..beaa2940 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -42,6 +42,7 @@ gladeui/glade-property-shell.c
 gladeui/glade-signal.c
 gladeui/glade-signal-def.c
 gladeui/glade-signal-editor.c
+gladeui/glade-signal-model.c
 gladeui/glade-utils.c
 gladeui/glade-widget-action.c
 gladeui/glade-widget-adaptor.c