A couple of years ago, a developer by the name of jiefoxi released an Xposed Module named "App Locale." The goal was to let the user set language settings for individual applications. This is a great option for those who speak multiple languages and know they'll always be using a specific language in certain apps. However, the application stopped working with Nougat, so XDA Junior Member Flo354 forked the project and released "App Locale 2." Since this new Xposed Module was launched, Flo354 has been working to create a new icon, optimize the code even further, fix some bugs, and a couple of features that let you show/hide system apps or show only modified applications. You can download it from XDA Labs below.

XDA Labs (mobile link)

Xposed Module Repo