"garbage signs" in Polish text (http://wiadomosci.gazeta.pl/pub/rss/wiadomosci.htm)

Hello,
I have problem with “garbage signs” in Polish text (diacritic letters) from:
RSS/XML URL: http://wiadomosci.gazeta.pl/pub/rss/wiadomosci.htm
Website URL: http://wiadomosci.gazeta.pl/wiadomosci/0,114871.html

On “story” view there is a warning “Imperfect proxy due to http over https”
I use FF 56.02 (64 bit)

Other feeds in Polish are ok

Thanks in advance for any suggestions

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