That is a completely unfair comparison. For starters, Facebook is a for-profit advertising company and Wikipedia is a community-driven encyclopedia and should be judged by different standards

Second, both admins and users can edit Wikipedia when there’s a problem. Everyone is “responsible” for fixing it - or at the very least equally at fault

Next, the content in question. Facebook was (rightfully) given hell for hosting gore, CSAM, adult porn, etc. Things that are immoral, illegal, or outright dangerous. The offending content on Wikipedia is bad translations.

Lastly, the bigger issue is always enforcement of said content. Facebook was made aware of the problem users/pages/uploads and slacked off on doing anything. These Wikipedia pages have very low traffic and weren’t getting reported. And even with reports, Wikipedia then has to consult with people who speak the rare language.

They’re similar problems of vastly different scales