[gnome-clocks] Update POTFILES.in and POTFILES.skip

[Piotr Drąg <piotrdrag src gnome org>]

commit b3cbdef210506b1c83f031e51dbe332b9fb1fec9
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Mon Dec 24 14:35:34 2018 +0100

    Update POTFILES.in and POTFILES.skip

 po/POTFILES.in   | 6 ++++--
 po/POTFILES.skip | 4 ++++
 2 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 36a73c8..7947da8 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -1,7 +1,9 @@
+# List of source files containing translatable strings.
+# Please keep this file sorted alphabetically.
 data/gtk/help-overlay.ui
 data/gtk/menus.ui
-data/org.gnome.clocks.appdata.xml.in
-data/org.gnome.clocks.desktop.in
+data/org.gnome.clocks.appdata.xml.in.in
+data/org.gnome.clocks.desktop.in.in
 data/org.gnome.clocks.gschema.xml.in
 data/ui/alarmringing.ui
 data/ui/alarmsetupdialog.ui
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index 325d42f..edb89b3 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -1,3 +1,7 @@
+# List of source files that should *not* be translated.
+# Please keep this file sorted alphabetically.
+data/org.gnome.clocks.appdata.xml.in
+data/org.gnome.clocks.desktop.in
 src/alarm.c
 src/application.c
 src/clock.c