Can I customize AWS Cognito UI in any other language?

I am very new to AWS. I am trying to use AWS Cognito for SSO at work. Just like official document, I could put a company logo and edit CSS with the templates. However, I just wonder if I can edit more on the hosting UI. For instance, I would like to edit the "Sign in" button to Japanese word which means same to the English word "Sign in". I have searched about it, and couldn't find any suitable result or solution. I have tried to use Lambda to change its css before it was loaded, but failed anyway. Does anyone have an answer for this question?