Issue with Polish character

[Phoenix-1337x]

Hello, I am using this script as well, but when I try to display anything with Polish characters, I receive numbers instead some character.

For example:
"plik CSV z akcentami i zapisuj\u0119 go w Notepadzie, wybieraj\u0105c kodowanie UTF-8. Gdy czytam ten plik za pomoc\u0105 Javy, czyta równie\u017c znaki BOM.""

How can I resolve this issue? I suspect there is an encoding problem inside the script ?