I need something like https://www.mediawiki.org/wiki/Localisation_statistics , or like https://commons.wikimedia.org/wiki/Module:Fallbacklist - basically, a single page (not a visual) that allows me to quickly search for a language name and figure out which fallback language/cluster it belongs to.
If I had to check only on a few languages, I'm aware, per Amir, that I could manually look for the $fallback line in the relevant file in https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/refs/heads/master/languages/messages/ , but that is not doable for dozens or hundred checks.
If we had an up-to-date list, we may be able to build better delivery lists for MassMessage rather than always resorting to using English to message wikis. (Think https://meta.wikimedia.org/wiki/Distribution_list/Global_message_delivery/fr, but it also has Wolof and others.)
If folks know how to build such a resource, even though they can't personally do it - please just document it? Thanks.