List of steps to reproduce (step by step, including full links if applicable):

• View a static map of a region with Japanese local script

What happens?:

• Labels which cannot be translated fall back to the local script.

What should have happened instead?:

• Local script is good, but some scripts such as Latin have an even nicer fallback in which the labels are transliterated automatically into the reader's preferred script (as guess from the lang parameter):

https://maps.wikimedia.org/img/osm-intl,15,35.678,139.772,300x400.png?lang=en

For comparison, here's the same area with "Russian" labels:
https://maps.wikimedia.org/img/osm-intl,15,35.678,139.772,300x400.png?lang=ru

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.: