Thai dates may use non-Gregrorian calendar by default

[calliopejen]

You may want to disable or change the date game for th.wiki -- Thai dates are written using a different calendar -- see https://en.wikipedia.org/wiki/Thai_calendar . Some of the dates in th.wiki (marked with ค.ศ.) are normal AD dates, while others (marked with พ.ศ.) are dates using the Thai calendar. I'd imagine that most dates without markings are for the Thai calendar, but I don't know enough to say. I'm not sure if other language wikipedias could have this issue as well (maybe ar.wiki?).