Use LocalizedStringKeys
Using them for title and subtitle would support localization for notification content with a string catalog.
Can you be more explicit here? Can't you pass already localized strings to the framework?
I mean that changing the type of title and subtitle from String to LocalizedStringKey would list all used strings in a string catalog to adapt them to the different languages.
As far as I know it's not possible to do that with Strings.
Sadly that won't work, as the view itself is implemented using UILabel's. So you have to use NSLocalizedString("string-key", comment: "") to pass localized strings to the present() functions. Or use the newer presentSwiftView(styleName:viewBuilder:completion:) to present a custom swift view.