Something I thought about because of the Weblate migration, but can be done independently:
It would be nice to see a table like this directly inside Matomo using live data. This way it would never need to be outdated and could be combined with other information about translating Matomo
console translations:languageinfo this could use
\Piwik\Plugins\LanguagesManager\API::getAvailableLanguagesInfo() which should also contain the information about the translators from
I'm just not sure where to put this page. At Platform besides "API" and "Widgets" seems a bit too prominent. So maybe the Feedback page (the (i) in the top right) might be better suited.