diff --git a/framework/framework/server.ts b/framework/framework/server.ts
index b6fcbb561..00d83957f 100644
--- a/framework/framework/server.ts
+++ b/framework/framework/server.ts
@@ -313,7 +313,7 @@ function executeMiddlewareStack(context: any, middlewares: { name: string, func:
     return dispatch(0);
 }
 
-interface WebServiceConfig {
+export interface WebServiceConfig {
     keys: string[];
     proxy: boolean;
     cors?: string;
@@ -697,7 +697,7 @@ declare module 'cordis' {
     }
 }
 
-export async function apply(ctx: Context, config) {
+export async function apply(ctx: Context, config: WebServiceConfig) {
     ctx.provide('server', undefined, true);
     ctx.server = new WebService(ctx, config);
 }
diff --git a/packages/hydrooj/src/lib/i18n.ts b/packages/hydrooj/src/lib/i18n.ts
index ed1da6fd9..fa1a7959c 100644
--- a/packages/hydrooj/src/lib/i18n.ts
+++ b/packages/hydrooj/src/lib/i18n.ts
@@ -7,6 +7,11 @@ declare module '../context' {
         i18n: I18nService;
     }
 }
+declare module '../service/bus' {
+    interface EventMap {
+        'app/i18n/update': (lang: string) => void;
+    }
+}
 declare global {
     interface String {
         translate: (...languages: string[]) => string;
@@ -22,6 +27,7 @@ class I18nService extends Service {
         this.ctx.effect(() => {
             translations[lang] ||= [];
             translations[lang].unshift(content);
+            this.ctx.emit('app/i18n/update', lang);
             return () => {
                 translations[lang] = translations[lang].filter((i) => i !== content);
             };
diff --git a/packages/ui-default/backendlib/builder.ts b/packages/ui-default/backendlib/builder.ts
index f79137b0d..23fe6b739 100644
--- a/packages/ui-default/backendlib/builder.ts
+++ b/packages/ui-default/backendlib/builder.ts
@@ -145,5 +145,6 @@ export async function apply(ctx: Context) {
   ctx.on('system/setting', () => triggerHotUpdate());
   ctx.on('app/watch/change', triggerHotUpdate);
   ctx.on('app/watch/unlink', triggerHotUpdate);
+  ctx.on('app/i18n/update', debouncedBuildUI);
   debouncedBuildUI();
 }