Do you see any other error(s) in console?

I tried to reproduce this, Yandex is working fine. But Apertium was throwing error:

{"status":500,"type":"internal_error","title":"Error","detail":"Translation with Apertium en>es failed: HTTPError: 504: internal_http_error","method":"POST","uri":"/v2/translate/en/es/Apertium"}

The original problem with Yandex cannot be reproduced, and Apertium works for me now too.
In the process of checking I found another example of unintended scrollbars (T202180#4816371)