Set the default language of WProofreader to EN_AI on our demos

[wwalc]

Page: https://ckeditor.com/docs/ckeditor5/latest/features/spelling-and-grammar-checking.html
Language code: EN_AI https://docs.webspellchecker.net/display/WebSpellCheckerServer55x/Default+languages+list
Option name: lang https://webspellchecker.com/docs/api/wscbundle/Options.html

[godai78]

I made the changes, but can't seem to get it to work and test it on my local server (didn't work before changes either). @ckeditor/qa-team can you have a look? Working branch is /docs-spelling-ai.

[godai78]

Thanks @Mgsy for workaround. Pushed.