Update Polish translation

Co-authored-by: Hosted Weblate <hosted@weblate.org>
Co-authored-by: Matthaiks <kitynska@gmail.com>

locales/pl.json

@@ -521,5 +521,6 @@
     "timeline_parse_error_placeholder_heading": "Nie można przeanalizować elementu",
     "timeline_parse_error_show_technical_details": "Pokaż szczegóły techniczne",
     "preferences_default_playlist_none": "Brak domyślnej playlisty",
-    "preferences_default_playlist": "Domyślna playlista: "
+    "preferences_default_playlist": "Domyślna playlista: ",
+    "Livestreams": "Na żywo"
 }