add Bulgarian translation

* Bulgarian PO files

Български превод на приложението

* Delete bg.mo

* Delete bg.po

* Delete bg.po~

* Bulgarian Translation

Български превод на приложението.

* Update i18n.md

* Delete po/bg.mo

* Delete po/bg.po~

docs/i18n.md

@@ -68,6 +68,7 @@ Some of the languages Solaar has been translated to are listed below. A full lis
 - Swedish: John Erling Blad, [Daniel Zippert][zipperten], Emelie Snecker, Jonatan Nyberg
 - Turkish: Osman Karagöz
 - Ukrainian: Олександр Афанасьєв
+- Bulgarian Николай Йорданов
 
 [Rongronggg9]: https://github.com/Rongronggg9
 [papoteur]: https://github.com/papoteur