English is the default language for Workhub. To change it to your preferred language, click on My Profile on the top right of the screen. You will be brought to a page that displays your account details and personal preferences.
Please note, that the translations available are pretty experimental. We use Google Translate and while it's not always perfect, it is getting better and better as more users suggest corrections.
Once you've selected the language of your choice click the Save button in the top right.
If you need to switch back to English, it's always at the top of the drop down selections.