chore: Update translations (#1561)

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>
Co-authored-by: Yovan Lutfi Arya (Regerta)
Co-authored-by: Goudarz Jafari (Goudarz)
Co-authored-by: korho
Co-authored-by: vfasoulas

app/javascript/dashboard/i18n/locale/pl/conversation.json

@@ -24,6 +24,7 @@
     "REPLYING_TO": "You are replying to:",
     "REMOVE_SELECTION": "Usuń zaznaczenie",
     "DOWNLOAD": "Pobierz",
+    "UPLOADING_ATTACHMENTS": "Uploading attachments...",
     "HEADER": {
       "RESOLVE_ACTION": "Rozwiąż",
       "REOPEN_ACTION": "Otwórz ponownie",