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@Villfuk 02 welcome to the Atlassian community
Switching language for our Trello mobile apps isn't currently an option. Trello will automatically use the language that you've selected as the system language for your device.
https://help.trello.com/article/745-is-trello-available-in-other-languages#:~:text=To switch to a different,click on "Change Language".
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