Merge branch 'develop' into develop

frontend/src/locale/IntlProvider.tsx

@@ -12,6 +12,7 @@ import langSk from "./lang/sk.json";
 import langVi from "./lang/vi.json";
 import langZh from "./lang/zh.json";
 import langKo from "./lang/ko.json";
+import langBg from "./lang/bg.json";
 
 // first item of each array should be the language code,
 // not the country code
@@ -29,6 +30,7 @@ const localeOptions = [
 	["vi", "vi-VN", langVi],
 	["zh", "zh-CN", langZh],
 	["ko", "ko-KR", langKo],
+	["bg", "bg-BG", langBg],
 ];
 
 const loadMessages = (locale?: string): typeof langList & typeof langEn => {