Correct spelling Bulgarian
Correct spelling Bulgarian

Summary:
Bulgar, is an old, extinct language. :D The language is called Bulgarian, for last 14 centuries.
Closes https://github.com/facebookresearch/fastText/pull/157

Differential Revision: D4643024

Pulled By: EdouardGrave

fbshipit-source-id: 93f66db1a3e0c955163421fd7c8f3b43a42f6fd4

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