Change logo with language change.

Hi there!
I love polylang but now i need to change also logo when changing language.
I tried to use some answers from the web but it doesn’t work for me…or maybe i dont know how to use them properly .for eg this: http://support.pojo.me/docs/polylang-change-logo-every-language/
Maybe you could help me with it? Maybe it needs some other modifications with my theme?
my page is: http://argentum200.pl