Make it easy to localize the map labels

[boldtrn]

Motivation

In #43 we removed a bit of special Mapbox code. We also found code that allows to select the map labels that match the current users locale:

maplibre-navigation-ios/MapboxNavigation/NavigationMapView.swift

Line 993 in 3eda169

@objc public func localizeLabels() {

We should check how we could make this method easier to use. Maybe we can find a good way to support the common schemas like OMT and make it possible for users to overwrite this if a different schema is used.