Allow Wikipedia search to handle proper nouns that don't follow first-letter capitalization

[mileswwatkins]

Words with internal capitalization (eg, Robert MacNamara) will fail in the Wikipedia search most of the time. It doesn't appear that the Wikipedia/Wikimedia REST API offers a search functionality, but maybe the other Wikipedia/Wikimedia XML/JSON APIs do, in which case we could fall back to that one.

See further explanation for how our current search functionality works inline at https://github.com/mileswwatkins/Mouse/blob/main/functions/wikipedia.private.js#L7-L17