[gnome-control-center] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit e50abfcd06afea1fbc5ecb6c8ef8ba232db34c6c
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Wed Feb 6 23:01:18 2019 +0100

    Update POTFILES.in

 po/POTFILES.in | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index d896f53d1..5de542cf5 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -179,7 +179,9 @@ panels/sharing/cc-sharing-panel.ui
 panels/sharing/gnome-sharing-panel.desktop.in.in
 panels/sharing/networks.ui
 panels/sharing/org.gnome.controlcenter.remote-login-helper.policy.in.in
-panels/sound/cc-alert-slider.ui
+panels/sound/cc-alert-chooser.c
+panels/sound/cc-alert-chooser.ui
+panels/sound/cc-alert-selector.ui
 panels/sound/cc-balance-slider.ui
 panels/sound/cc-fade-slider.ui
 panels/sound/cc-output-test-dialog.c