Works (portfolio) page & Polylang

Hi, I encounter a problem with Polylang on the works (portfolio) page. The header does not show the translated string/title of the page “applications” but the string from the default language “aplikacje” (pl). Second, when you enter the work there is a button on bottom to show all the works and it points the default language. I do not have any idea how to sort it out. Please help.

The page I need help with: [log in to see the link]