Add Bulgarian language.

[FALL1N1]

No description provided.

[galaipa]

Thank you for the language file. I will add it in next release.

II will not merge the pull request because the source here is a bit old. I will update it and then accept it.

[galaipa]

Hi, there are new strings
39: You joined the game (Player {1}, Arena {2})
40: Your selection

Thanks

[FALL1N1]

39: Ti vleze v igrata (Igrach {1}, Arena {2})
40: Vashata markirovka