Yes, you can if you are an individual plan user in Indonesia or Hong Kong.
For example, Hong Kong Premium plan users will have Traditional Chinese (Cantonese) as default & an additional English option to choose from.
You can select "Settings" in the drop down list on the top right hand corner. You will be directed to the settings for the language and you can select your preferred language at the "Change" button. Click on "Confirm" after selection and the language interface will change.