[gnome-calculator] Update Polish translation

[Piotr Drąg <piotrdrag src gnome org>]

commit eb20794a277aa576b947a5dd92633271dbce9f39
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Sep 6 00:39:17 2018 +0200

    Update Polish translation

 po/pl.po | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/po/pl.po b/po/pl.po
index 42ae8486..9dfffd95 100644
--- a/po/pl.po
+++ b/po/pl.po
@@ -13,8 +13,8 @@ msgstr ""
 "Project-Id-Version: gnome-calculator\n"
 "Report-Msgid-Bugs-To: https://gitlab.gnome.org/GNOME/gnome-calculator/";
 "issues\n"
-"POT-Creation-Date: 2018-09-05 20:02+0000\n"
-"PO-Revision-Date: 2018-09-05 23:15+0200\n"
+"POT-Creation-Date: 2018-09-05 21:17+0000\n"
+"PO-Revision-Date: 2018-09-06 00:38+0200\n"
 "Last-Translator: Piotr Drąg <piotrdrag gmail com>\n"
 "Language-Team: Polish <community-poland mozilla org>\n"
 "Language: pl\n"
@@ -2900,5 +2900,11 @@ msgstr "Za_kończ"
 msgid "Defined Functions"
 msgstr "Określone funkcje"
 
+msgid "Defined Variables"
+msgstr "Określone zmienne"
+
+msgid "Select no. of arguments"
+msgstr "Wybiera liczbę argumentów"
+
 msgid "in"
 msgstr "na"