Correct spelling Bulgarian

Summary:
Bulgar, is an old, extinct language. :D The language is called Bulgarian, for last 14 centuries.
Closes facebookresearch#157

Differential Revision: D4643024

Pulled By: EdouardGrave

fbshipit-source-id: 93f66db1a3e0c955163421fd7c8f3b43a42f6fd4

pretrained-vectors.md

@@ -25,7 +25,7 @@ The models can be downloaded from:
 * [*Bengali*](https://s3-us-west-1.amazonaws.com/fasttext-vectors/wiki.bn.zip)
 * [*Bosnian*](https://s3-us-west-1.amazonaws.com/fasttext-vectors/wiki.bs.zip)
 * [*Breton*](https://s3-us-west-1.amazonaws.com/fasttext-vectors/wiki.br.zip)
-* [*Bulgar*](https://s3-us-west-1.amazonaws.com/fasttext-vectors/wiki.bg.zip)
+* [*Bulgarian*](https://s3-us-west-1.amazonaws.com/fasttext-vectors/wiki.bg.zip)
 * [*Burmese*](https://s3-us-west-1.amazonaws.com/fasttext-vectors/wiki.my.zip)
 * [*Catalan*](https://s3-us-west-1.amazonaws.com/fasttext-vectors/wiki.ca.zip)
 * [*Cebuano*](https://s3-us-west-1.amazonaws.com/fasttext-vectors/wiki.ceb.zip)