[libpanel] po: add i18n support

[Christian Hergert <chergert src gnome org>]

commit 932b79c56101a149f7b6665a1f7bec419d2429fe
Author: TAO ZUHONG <taozuhong gmail com>
Date:   Tue Aug 9 13:11:24 2022 +0000

    po: add i18n support

 po/POTFILES.in   | 7 +++++++
 po/POTFILES.skip | 0
 2 files changed, 7 insertions(+)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
new file mode 100644
index 0000000..a013c11
--- /dev/null
+++ b/po/POTFILES.in
@@ -0,0 +1,7 @@
+src/panel-frame-header-bar.c
+src/panel-frame-header-bar.ui
+src/panel-frame.ui
+src/panel-maximized-controls.c
+src/panel-save-dialog.c
+src/panel-save-dialog.ui
+src/panel-signal-group.c
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
new file mode 100644
index 0000000..e69de29