Hi Robert.
Joomdle is not translated yet to Polish, so you will need to create all the files. If you do it, it would be great if you can share it, so we can include it in a future Joomdle release.
You will need to create all the joomdle lang files, for polish.
To do that, you can start by copying the english ones, and then doing the translations.
Files to copy/translate are:
language/*joomdle*
administrator/language/*joomdle*
As there are many modules, plugins, etc, you will need to translate each file separately.
Let us know if you have any doubt.
