My widgets are either in Ukrainian or Belarusian language when I haven ONLY English selected in Wikipedia options, and even removed everything but English (& Russian) language both from region and from keyboard settings.
When I had first put widgets they were all in English, but not anymore and I haven’t changed anything.
Version: WikipediaApp/7.2.0.2061 (iPadOS 16.3.1; Tablet)
Check a recorded video from here.