How to change problem statement language?

Правка en3, от I_need_7.0_IELTS, 2023-06-16 05:54:45

I have setted a problem on Polygon for my private group. Its statement has 2 languages: Vietnamese and English. However, when I open my problem on Codeforces, I cannot find the way to change the problem statement to Vietnamese (English is default). Can anyone help me? Thank you in advance.

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  Rev. Язык Кто Когда Δ Комментарий
en3 Английский I_need_7.0_IELTS 2023-06-16 05:54:45 22
en2 Английский I_need_7.0_IELTS 2023-06-16 05:53:21 1
en1 Английский I_need_7.0_IELTS 2023-06-16 05:53:03 381 Initial revision (published)