Hello Nouria,
Welcome to Atlassian Community!
There are two options to change the language in Trello.
1 - On the top right, click on your profile picture > change language > select the desired language.
2 - If the option above is not available, then you must change it on your Atlassian account. Go to https://id.atlassian.com/manage-profile/account-preferences and change the language.
If you have any other questions regarding this matter, please let us know.
Regards,
Angélica
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