To change your wallet’s language first tap on the rightmost icon on your navigation tab bar to go to Settings. There, tap on Change Language which will open a modal with all available languages to be selected. Tap on a language and you will be prompted for an application restart. If you choose to do so, the app will restart and you will be able to use it in your language of choice.
Help & Tutorials: https://medium.com/tronwallet-support