[Решено] Translation button not working properly

Background of the issue:
I am trying to ensure that the language selection button in the header displays correctly on my website. The issue can be seen on this page: скрытая ссылка.

Symptoms:
The language selection button in the header is displaying random characters like "™���๨ ��^r�+�'`z" instead of the proper text.

Questions:
What could be the solution for the language selection button displaying random characters?