Hello Konrad Bosak

Please share a screenshot of your issue.

Best regards

https://prnt.sc/10dmmcz

Please share your administrator access here to check. Use the Hidden Content box to share the credentials. Also share the exact page link for translation.

        in hidden content

and?

Apology for the delay. Please share the page link where you need the translation and share your FTP Details.

month name filter: https://prnt.sc/10dmmcz in hidden content access

Please try the fix.

1. Go to Languages folder and create a folder named overrides.
2. Inside Overrides folder create a file named pl-PL.overrides.ini
3. Then add COM_SPLMS_DETAILS = "Your Translation"

this will change the button text. For months, it is probably not possible.

I created, not working.

Please share your FTP details again. I could not login using previously shared credentials.

i hidden content

Your issue is fixed now. Please check your site.