diff --git a/libertree/lang/pl/messages.po b/libertree/lang/pl/messages.po
new file mode 100644
index 000000000..b7650aa09
--- /dev/null
+++ b/libertree/lang/pl/messages.po
@@ -0,0 +1,48 @@
+# ADDON libertree
+# Copyright (C)
+# This file is distributed under the same license as the Friendica libertree addon package.
+# 
+# 
+# Translators:
+# Waldemar Stoczkowski <waldemar.stoczkowski@gmail.com>, 2018
+msgid ""
+msgstr ""
+"Project-Id-Version: friendica\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2013-02-27 05:01-0500\n"
+"PO-Revision-Date: 2018-03-31 19:44+0000\n"
+"Last-Translator: Waldemar Stoczkowski <waldemar.stoczkowski@gmail.com>\n"
+"Language-Team: Polish (http://www.transifex.com/Friendica/friendica/language/pl/)\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Language: pl\n"
+"Plural-Forms: nplurals=4; plural=(n==1 ? 0 : (n%10>=2 && n%10<=4) && (n%100<12 || n%100>14) ? 1 : n!=1 && (n%10>=0 && n%10<=1) || (n%10>=5 && n%10<=9) || (n%100>=12 && n%100<=14) ? 2 : 3);\n"
+
+#: libertree.php:36
+msgid "Post to libertree"
+msgstr "Opublikuj na libertree"
+
+#: libertree.php:67
+msgid "libertree Post Settings"
+msgstr "libertree Ustawienia Post"
+
+#: libertree.php:69
+msgid "Enable Libertree Post Addon"
+msgstr "Włącz dodatek Libertree Post"
+
+#: libertree.php:74
+msgid "Libertree API token"
+msgstr "Token API Libertree"
+
+#: libertree.php:79
+msgid "Libertree site URL"
+msgstr "Adres URL witryny Libertree"
+
+#: libertree.php:84
+msgid "Post to Libertree by default"
+msgstr "Wyślij domyślnie do Libertree"
+
+#: libertree.php:90
+msgid "Submit"
+msgstr "Wyślij"
diff --git a/libertree/lang/pl/strings.php b/libertree/lang/pl/strings.php
index 5f2122486..afb721b6a 100644
--- a/libertree/lang/pl/strings.php
+++ b/libertree/lang/pl/strings.php
@@ -1,9 +1,14 @@
-<?php
-
-$a->strings["Post to libertree"] = "";
-$a->strings["libertree Post Settings"] = "";
-$a->strings["Enable Libertree Post Addon"] = "";
-$a->strings["Libertree API token"] = "";
-$a->strings["Libertree site URL"] = "";
-$a->strings["Post to Libertree by default"] = "";
-$a->strings["Submit"] = "Potwierdź";
+<?php
+
+if(! function_exists("string_plural_select_pl")) {
+function string_plural_select_pl($n){
+	return ($n==1 ? 0 : ($n%10>=2 && $n%10<=4) && ($n%100<12 || $n%100>14) ? 1 : $n!=1 && ($n%10>=0 && $n%10<=1) || ($n%10>=5 && $n%10<=9) || ($n%100>=12 && $n%100<=14) ? 2 : 3);;
+}}
+;
+$a->strings["Post to libertree"] = "Opublikuj na libertree";
+$a->strings["libertree Post Settings"] = "libertree Ustawienia Post";
+$a->strings["Enable Libertree Post Addon"] = "Włącz dodatek Libertree Post";
+$a->strings["Libertree API token"] = "Token API Libertree";
+$a->strings["Libertree site URL"] = "Adres URL witryny Libertree";
+$a->strings["Post to Libertree by default"] = "Wyślij domyślnie do Libertree";
+$a->strings["Submit"] = "Wyślij";