Use localized name property by default

[1ec5]

When Mapbox GL Language is present, default to the name_* property that corresponds to the user’s current locale. We could keep the accessibleLabelProperty property around for data visualization use cases that aren’t so heavily focused on the Mapbox Streets source.

/cc @tristen @lukasmartinelli

[1ec5]

The iOS implementation in mapbox/mapbox-gl-native#9950 additionally transliterates the name into Latin script using ICU if the user’s language is written in a Latin alphabet. This ensures that the labels remain comprehensible in a screen reader, since most screen readers are only capable of reading one language at a time, even if the user can comprehend multiple languages and multiple scripts.

https://github.com/mapbox/mapbox-gl-native/blob/dcd7da14f6627a09a5840a3046b5708449962f69/platform/ios/src/MGLMapAccessibilityElement.mm#L52-L67

However, I don’t believe there are any client-side facilities for transliteration on the Web platform. There may be server APIs for transliteration, but that might be out of scope for this plugin.