ui: enhance language selection

packages/hydrooj/src/model/system.ts

@@ -71,13 +71,8 @@ export async function runConfig() {
     await bus.emit('database/config');
 }
 
-// eslint-disable-next-line import/no-mutable-exports
-export let lang = {};
-
 bus.on('system/setting', (args) => {
     for (const key in args) set(key, args[key], false);
-    if (!args['hydrooj.lang']) return;
-    lang = parseLang(args['hydrooj.lang']);
 });
 
 global.Hydro.model.system = {
@@ -86,5 +81,4 @@ global.Hydro.model.system = {
     getMany,
     inc,
     set,
-    lang,
 };