added bg-BG (Bulgarian)

src/lib/i18n/locales/languages.json

@@ -1,4 +1,8 @@
 [
+	{
+		"code": "bg-BG",
+		"title": "Bulgarian (BG)"
+	},
 	{
 		"code": "en-US",
 		"title": "English (US)"
@@ -47,4 +51,4 @@
 		"code": "zh-TW",
 		"title": "Chinese (Traditional)"
 	}
-]
+]