BBC: "Climate change: Conspiracy theories found on foreign-language Wikipedia" https://www.bbc.co.uk/news/technology-59325128
Slate: "Non-English Editions of Wikipedia Have a Misinformation Problem" (about historical revisionism in Japanese Wikipedia, the far right Croatian Wikipedia, etc.) https://slate.com/technology/2021/03/japanese-wikipedia-misi...
WMF report on Croatian Wikipedia ("captured by ideologically driven users", "intentionally distorted the content presented in articles, abused power, and systematically obstructed otherwise accepted global Wikipedia community practices"): https://meta.wikimedia.org/wiki/File:Croatian_WP_Disinformat...
Even within the English Wikipedia, you can find pages with surprising slants. See e.g. https://en.wikipedia.org/wiki/Wikipedia:Wikipedia_Signpost/2...
By and large, though, I think most people would agree that politically Wikipedia skews somewhat left of centre.