The 2018 improvements to internationalised names are a vast improvement for maplink and mapframe. It would be great (and maybe not complicated) to make them available to the other mapping template at 'Graph:Street map with marks' as well
To have the new default of 'language of the wiki', even without all the additional versions, would be a huge improvement over the current version for pretty much everyone. For consistent terminology the current 'osm-intl' could be renamed as osm-local to match the maplink usage, leaving osm-intl as the new default. The no-labels 'osm' style has also been useful, so to end up with all three would be great.
The hint I have received is that it needs to add a language parameter to the graphoid service, and let it pass it through to the map service, at https://github.com/nyurik/mw-graph-shared/blob/master/src/VegaWrapper.js#L306