Radiant Photo is like a true polyglot; it's currently available in multiple languages to cater to its global audience. The supported languages include English, Spanish, German, French, Chinese, Korean, Japanese, Portuguese, Hindi and Indonesian.
How can I change the language?
For Android, please refer to the instructions here: https://support.google.com/android/answer/12395118
On iOS/iPadOS, go to System Settings > Radiant Photo > Language