[gtranslator] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit 62eb212eb8dc122be8fddb67dba321e0f87408fa
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sun May 19 11:56:01 2019 +0200

    Update POTFILES.in

 po/POTFILES.in | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index e2f95f5d..bbd6be46 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -16,12 +16,13 @@ src/gtr-context.c
 src/gtr-context.ui
 src/gtr-dl-teams.ui
 src/gtr-file-dialogs.c
+src/gtr-filter-selection.ui
 src/gtr-header-dialog.c
 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-lang-button.c
 src/gtr-languages-fetcher.ui
 src/gtr-message-table.c
 src/gtr-notebook.c