[gtranslator] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit 5dfcfb68692d122b9eac0112b150a630af76d8a8
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Fri Oct 26 21:13:18 2018 +0200

    Update POTFILES.in

 po/POTFILES.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index acd646b4..a85233c3 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -44,6 +44,7 @@ src/gtr-header-dialog.ui
 src/gtr-io-error-info-bar.c
 src/gtr-jump-dialog.c
 src/gtr-jump-dialog.ui
+src/gtr-lang-button.ui
 src/gtr-languages-fetcher.ui
 src/gtr-message-table.c
 src/gtr-notebook.c