Trello is currently available in the following languages:
English, Portuguese, French, Spanish, German, Finnish, Norwegian, Swedish, Russian, Polish, Hungarian, Ukrainian, Czech, Dutch, Italian, Turkish, Thai, Japanese, Traditional Chinese, Simplified Chinese and Vietnamese.
If you want to contribute you can reach out to the Trello team, but from what I am seeing here, at this time they are not translating any new languages:
If you had to thrive a new habit during a lockdown, what would it be? Trello
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