The translate feature was quite used with #Fedilab. So that will be the first fix. I will use Bing that still offers a free Api key.
In the meantime, you can switch to another translator in settings (Systrans or DeepL, but it's up to you to create your own Api key that you can insert inside the app).
PS: Yandex shut down its free translation Api (that's why you're getting this issue).
@fedilab oh good of you to post this - I had wondered about that today
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