Change PT type dropdown to "China" and "Other"
At the dev meeting, we discussed making both BridgeDB and Tor Launcher maintain a table of country to disallowed PT types. Right now, we only have one country that blocks PTs based on DPI of their transport format: China. They only do this with vanilla bridges and obfs2 at the moment.
The idea is if the user seltects "China", Tor Launcher will pick a PT type at random from everything but the types that "China" excludes, and use default bridges from that type from then on. For "Other", it would select a type from all types, with no exclusions.
Unfortunately, this is tricky because we still want to expose the selected PT type so the user can at least easily click on a bridgedb link for that type. It is also tricky in that we probably need to localize the country names, as well as "Other".