That's a good idea! An offline would be as easy as just making a parallel mediawiki API that serves from a local server. I will check out implementations.

Server fees aren't an issue with this deployment as it's just a small static app, though if this were to be big it would be a load on the mediawiki API, so if there's more interest than this as a hobbyist side project I should serve some of my own and cache (as I'm loading a lot of images in parallel)

I looked up your pingtype project, it looks like it's for translating English <=> Chinese. Would that be for translating articles? For that I imagine I should add the feature for viewing Wikipedia in different languages.