Pocket Thai Master: Learn Thai

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You can now check quizzes that include audio and see the correct answers with audio included. I also fixed a few transcription errors in Lessons 17 and 20, and made a few small updates to the culture lessons.

I totally re-wrote the code that handles audio, so all audio issues and crashes should be fixed. If you have any issues with audio or anything else after this update, please send me an email (evan@pocket-thai.com) and I'll make sure to address it as soon as I can. Thanks!