How to set up the language on Apple Watch

I just start using the Omnifocus on my Watch and it is great, but I am facing a problem: the app is in running in chinese!! How can change it to English?

Does it run in Chinese on your phone? Does anything else run in Chinese on the watch?

No, I was running in Portuguese.

I did a test and change de language to English and now Omnifocus is running in English. Thanks for your comment, it helped me to solve the problem.