Pontoon: Update Polish (pl) localization of Firefox Send

Localization authors:
- Piotr Drąg <piotrdrag@gmail.com>

public/locales/pl/send.ftl

@@ -0,0 +1,20 @@
+# Firefox Send is a brand name and should not be localized.
+title = Firefox Send
+
+## Send version 2 strings
+
+# Firefox Send, Send, Firefox, Mozilla are proper names and should not be localized
+-send-brand = Firefox Send
+-send-short-brand = Send
+-firefox = Firefox
+-mozilla = Mozilla
+# byte abbreviation
+bytes = B
+# kibibyte abbreviation
+kb = KB
+# mebibyte abbreviation
+mb = MB
+# gibibyte abbreviation
+gb = GB
+# localized number and byte abbreviation. example "2.5MB"
+fileSize = { $num } { $units }