Sinhala Language

Sri Lanka Sinhala Language translation
@iamchathu We're really excited to see Sinhala supported in Brackets!

We're about to release 0.44 soon and have many new strings that will need translating plus there are still the 2 untranslated string from 1-September of this year.  Any chance you can get the translations finished tonight?  

If not we may not be able to get your translation in until the next release.

This is such a great contribution. Thank you!