How to localize scopes and their description?
I’m assuming you refer to the scopes you can configure in your own API as those do have an associated description.
At this time the scopes and the descriptions may be shown as part of the consent dialog, however, this page is not yet customizable so there’s currently no support for showing scope information in different languages. The customization of this page which would likely enable that scenario is something already planned, but at this time I cannot provide you with a timeline for its availability.