Add Bulgarian locale.

[haltsir]

Ths PR adds support for Bulgarian transliteration. The rules are copied from the official Bulgarian Transliteration Law.

One exception that might occur, but afaik is not supported in the library, is changing the final two letters to 'ia' instead of 'iya' when the word ends in 'ия' (e.g. Мизия should be transliterated to Mizia instead of Miziya). A second exception is that the official country name is always transliterated to "Bulgaria" instead of "Balgariya". The third exception is that the currency "лв." should be transliterated to "leva". If the library could somehow support words as well, then two of the three exceptions would be resolved. For the first exception it's needed to check the end of the words only.

[simov]

Thanks for contributing, all good points. I don't think that we will be able to resolve those edge cases right now, even though they seem quite severe IMO.

I'm fine with updating those alphabet letters as they seem correct to me, however, I'm thinking that all other special characters should be removed in general, probably in next major or something like that. The reason why is that this only inflates the library size (for browsers that matter) without any real benefit. Users can extend the library and add those if needed.

[haltsir]

I understand, do you want me to remove them now or would you that when you do it for every transliteration?

[simov]

I'd prefer to have them removed now, I know we have them for other locales, but this just keeps inflating the library size and eventually I'd like to remove them for all.

[simov]

Thanks 👍

[simov]

Published in v1.6.2

[haltsir]

Thank you!