[gnome-tetravex] shortcuts: make shortcuts overlay translatable

[Jeremy Bicha <jbicha src gnome org>]

commit 4825757ca814aebef0a4d74d72b6ee3a8d3705d6
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Sun Dec 9 21:33:03 2018 -0500

    shortcuts: make shortcuts overlay translatable

 po/POTFILES.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 93d8478..4317c9d 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -6,6 +6,7 @@ data/org.gnome.tetravex.gschema.xml
 src/app-menu.ui
 src/gnome-tetravex.ui
 src/gnome-tetravex.vala
+src/help-overlay.ui
 src/puzzle.vala
 src/puzzle-view.vala
 src/score-dialog.vala