Core MediaWiki already defines ordered lists for non-Western numerals in [[ https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/refs/heads/master/resources/src/mediawiki.skinning/i18n-ordered-lists.less | i18n-ordered-lists.less ]]: Persian, Hindi, Odia, and a few more.
However, we need a few more, but they don't have standardized `list-style-type` values. These writing systems are Arabic, Ol Chiki (Santali), Meetei (Manipuri), and N'Ko.
At the moment, it's possible to do this using `@counter-style`, which is standard CSS, but only works on Firefox ([[ https://bugs.chromium.org/p/chromium/issues/detail?id=687225 | upstream Chromium bug ]]). I nevertheless added this to Common.css and Mobile.css in the Wikipedias in these languages, because it's better than nothing. Eventually it should be moved to core.
Tagging #Upstream, because it cannot be complete without being supported in Chrome and similar browsers, but it can be partly resolved by changing CSS core.