[נפתר] Wrong language on FB browser

Background of the issue:
I am trying to open soranora.lt from a Facebook ad. When opening soranora.lt from the Facebook app (ad or post), the page is opened in the internal FB browser. I expect to see the page in the language assigned to the domain, but I get the default language. Link to a page where the issue can be seen: קישור נסתר. FB internal browser: קישור נסתר. Chrome browser: קישור נסתר.

Symptoms:
In the FB app internal browser, the page is visible in the default language (English), but not in the correct translated language. The domain soranora.lt is assigned to the Lithuanian language, but all the page is in English. When the page is opened directly in the Chrome browser, only then is the correct language visible.

Questions:
How can I ensure the page displays in the correct language when opened from a Facebook ad?