Localization
Localization is the feature that allows you to specify the language that's different from a default one (English)
Changes will be applied only to the user-mode - the surface that the end-users of your app will be interacting with. The builder mode will remain in the English
Inside the app builder, go to the top left corner and click on your account logo:

Then scroll down to the bottom of the page and find the Language dropdown. Choose your language from the dropdown:

If your language is not on the list, reach out to our support (bottom left corner in the app) with the request of adding your language
Once you save the changes, all the users who sign-up/log-in into the app (in the user mode) will see the localized version
Last modified 1mo ago