Changing your language in Trello
Trello is currently available in over 20 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.
Using Trello with an Atlassian account? Your language setting is synced from Atlassian, so you won't see the 'Change Language...' option below. You can change your language setting at https://id.atlassian.com/manage-profile/account-preferences
To switch language, log in to Trello, then go to the user profile menu in the top right corner of the page. Click on 'Change Language...' to choose your preferred language.
"Change Language" will show up in the current language, so if you're not sure which option to choose, it's the next-to-last item on the menu:
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.