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Add Buddhist calendar
I just got a user request for the Buddhist calendar. @grzesiek2010, you're our calendar expert so correctly if I'm wrong but I believe this is mostly easy to do and so we should just do it when we have a moment.
In fact, https://github.com/getodk/collect/pull/2650 had a start with joda-time.
https://stackoverflow.com/a/36773726/137744 has some more recent info about calendar libraries.