Adding locale Sinhala (si)

[Sinhala](http://en.wikipedia.org/wiki/Sinhala_language) is the language spoken by an ethnic group called [Sinhalese](http://en.wikipedia.org/wiki/Sinhalese_people) of around 15 million individuals, mainly residing in the island nation [Sri Lanka](http://en.wikipedia.org/wiki/Sri_Lanka).
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