Disable Polish language

The translation didn't arrive in time for the 3.6 release.

Contributes to issue CURA-5870.

resources/qml/Preferences/GeneralPage.qml

@@ -171,7 +171,7 @@ UM.PreferencesPage
                             append({ text: "日本語", code: "ja_JP" })
                             append({ text: "한국어", code: "ko_KR" })
                             append({ text: "Nederlands", code: "nl_NL" })
-                            append({ text: "Polski", code: "pl_PL" })
+                            //Polish is disabled for being incomplete: append({ text: "Polski", code: "pl_PL" })
                             append({ text: "Português do Brasil", code: "pt_BR" })
                             append({ text: "Português", code: "pt_PT" })
                             append({ text: "Русский", code: "ru_RU" })