[Закрытые] Translators\' language pairs

Background of the issue:
I am trying to use language pairs for our translators in WPML>Translation Management>Translators. We have 63 languages set up in WPML and are not using any ATE, just the normal WordPress Editor. There are error logs in ATE (Support) with the following error messages: {"url":"скрытая ссылка","requestArgs":{"method":"GET"},"status":426} {"url":"скрытая ссылка","requestArgs":{"method":"POST","body":[{"source_language":"no","target_languages":["af","sq","am","ar","bs","bg","my","zh-hans","da","prs","din","nl","en","et","fi","fr","de","el","gu","hi","hu","is","hil","id","it","ja","kar","km","kin","ko","kmr","lt","smj","mk","ms","mfe","ne","se","no","nn","ps","fa","pl","pt-pt","pa","ro","ru","sm","sr","si","so","ckb","sma","es","sw","sv","tl","ta","th","ti","tr","ur","uz","vi"]}]},"status":426}

Symptoms:
I cannot add/delete translators and cannot edit the language pairs. This issue started recently. I have tried the Troubleshooting page by cleaning up the cache, but the problem still exists.

Questions:
How can I add or delete translators?
How can I edit the language pairs for translators?
What does the error status 426 in ATE logs mean?
Is there a limit to the number of languages that can be set up in WPML?