[gnome-calculator/gnome-3-28] Update help LINGUAS

[Piotr Drąg <piotrdrag src gnome org>]

commit 9d8b05b8073cb073c247e2f5c72dd03fc8d71c85
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Tue Mar 27 00:38:04 2018 +0200

    Update help LINGUAS

 help/LINGUAS |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/help/LINGUAS b/help/LINGUAS
index 7420c68..8f62e08 100644
--- a/help/LINGUAS
+++ b/help/LINGUAS
@@ -15,6 +15,7 @@ ja
 ko
 lv
 oc
+pl
 pt
 pt_BR
 ro