feat(i18n): add Bulgarian language translation (#1394)

* feat(localization): add bulgarian language translation

* fix(locales/bg): make tests pass

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <xe.iaso@techaro.lol>
Signed-off-by: Xe Iaso <me@xeiaso.net>
Co-authored-by: Xe Iaso <xe.iaso@techaro.lol>
Co-authored-by: Xe Iaso <me@xeiaso.net>

lib/localization/localization_test.go

@@ -34,6 +34,7 @@ func TestLocalizationService(t *testing.T) {
 		"zh-CN": "加载中...",
 		"zh-TW": "載入中...",
 		"sv":    "Laddar...",
+		"bg":    "Зареждане...",
 	}
 
 	var keys []string