You will be able to change your preferred language on the preferences page of your account.
Finding the language setting
Profile->Account->Preferences
You can always find this page by clicking on your profile picture on the top right and clicking on account.
Then, in the left navigation menu, you will find the preference page where you can find the language setting.
Available languages
At the moment Catenda Hub is available in 21 languages: English, Danish, German, Spanish, Català, French, Indonesian, Japanese, Norwegian bokmål, Norwegian Nynorsk, Dutch, Polish, Thai, Portuguese (Brazilian), Swedish, Hungarian, Italian, Latvian, Vietnamese, and simplified and traditional Chinese.