diff --git a/build/prepare.js b/build/prepare.js
index bdee332e..5d1f8115 100644
--- a/build/prepare.js
+++ b/build/prepare.js
@@ -2,7 +2,6 @@ const fs = require('fs');
 const path = require('path');
 
 const dir = path.dirname(path.dirname(require.resolve('@types/node/package.json')));
-const files = fs.readdirSync(dir);
 
 const compilerOptionsBase = {
     target: 'es2020',
@@ -17,7 +16,7 @@ const compilerOptionsBase = {
     // emitDecoratorMetadata: true,
     noEmit: true,
     incremental: true,
-    types: files.filter((i) => !['sharedworker', 'serviceworker'].includes(i)),
+    types: fs.readdirSync(dir).filter((i) => !['sharedworker', 'serviceworker'].includes(i)),
 };
 const config = {
     compilerOptions: compilerOptionsBase,
@@ -69,24 +68,27 @@ fs.writeFileSync(path.resolve(process.cwd(), 'packages', 'ui-default', 'tsconfig
     },
 }));
 
-const packages = fs.readdirSync(path.resolve(process.cwd(), 'packages'));
-for (const package of packages) {
-    if (package === 'ui-default') continue;
-    const basedir = path.resolve(process.cwd(), 'packages', package);
-    const files = fs.readdirSync(basedir);
-    if (!files.includes('src') && !files.map((n) => n.split('.')[1]).includes('ts') && package !== 'utils') continue;
-    if (package !== 'hydrooj') config.references.push({ path: `packages/${package}` });
-    fs.writeFileSync(
-        path.resolve(basedir, 'tsconfig.json'),
-        files.includes('src') ? JSON.stringify(configSrc) : JSON.stringify(configFlat),
-    );
-    if (files.includes('src')) {
-        const inner = fs.readdirSync(path.resolve(basedir, 'src'));
-        for (const file of inner) {
-            if (!fs.statSync(path.resolve(basedir, 'src', file)).isFile()) continue;
-            const name = file.split('.')[0];
-            if (['handler', 'service', 'lib', 'model', 'script'].includes(name)) {
-                fs.writeFileSync(path.resolve(basedir, `${name}.js`), `module.exports = require('./src/${name}');\n`);
+for (const type of ['packages', 'plugins']) {
+    const packages = fs.readdirSync(path.resolve(process.cwd(), type));
+    for (const package of packages) {
+        if (package === 'ui-default') continue;
+        const basedir = path.resolve(process.cwd(), type, package);
+        if (!fs.statSync(basedir).isDirectory()) continue;
+        const files = fs.readdirSync(basedir);
+        if (!files.includes('src') && !files.map((n) => n.split('.')[1]).includes('ts') && package !== 'utils') continue;
+        if (package !== 'hydrooj') config.references.push({ path: `${type}/${package}` });
+        fs.writeFileSync(
+            path.resolve(basedir, 'tsconfig.json'),
+            files.includes('src') ? JSON.stringify(configSrc) : JSON.stringify(configFlat),
+        );
+        if (files.includes('src')) {
+            const inner = fs.readdirSync(path.resolve(basedir, 'src'));
+            for (const file of inner) {
+                if (!fs.statSync(path.resolve(basedir, 'src', file)).isFile()) continue;
+                const name = file.split('.')[0];
+                if (['handler', 'service', 'lib', 'model', 'script'].includes(name)) {
+                    fs.writeFileSync(path.resolve(basedir, `${name}.js`), `module.exports = require('./src/${name}');\n`);
+                }
             }
         }
     }
diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index e992059b..2b337f69 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.17.4",
+    "version": "3.17.5",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",
diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index 9ba8e92f..fb105402 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -349,6 +349,8 @@ export class ProblemDetailHandler extends ContestDetailBaseHandler {
                 const p = this.pdoc.config.subType;
                 const dl = [p, ...Object.keys(setting.langs).filter((i) => i.startsWith(`${p}.`))];
                 baseLangs = dl;
+            } else if (['objective', 'submit_answer'].includes(this.pdoc.config.type)) {
+                baseLangs = ['_'];
             } else {
                 baseLangs = Object.keys(setting.langs).filter((i) => !setting.langs[i].remote);
             }
@@ -478,7 +480,11 @@ export class ProblemSubmitHandler extends ProblemDetailHandler {
 
     async get() {
         this.response.template = 'problem_submit.html';
+        const langRange = (typeof this.pdoc.config === 'object' && this.pdoc.config.langs)
+            ? Object.fromEntries(this.pdoc.config.langs.map((i) => [i, setting.langs[i]?.display || i]))
+            : setting.SETTINGS_BY_KEY.codeLang.range;
         this.response.body = {
+            langRange,
             pdoc: this.pdoc,
             udoc: this.udoc,
             title: this.pdoc.title,
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index 3579d308..8f1aabe4 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.40.3",
+  "version": "4.40.4",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
diff --git a/packages/ui-default/pages/problem_detail.page.jsx b/packages/ui-default/pages/problem_detail.page.jsx
index ccddf20b..7a62b005 100644
--- a/packages/ui-default/pages/problem_detail.page.jsx
+++ b/packages/ui-default/pages/problem_detail.page.jsx
@@ -3,6 +3,7 @@ import $ from 'jquery';
 import yaml from 'js-yaml';
 import React from 'react';
 import { createRoot } from 'react-dom/client';
+import Notification from 'vj/components/notification';
 import { downloadProblemSet } from 'vj/components/zipDownloader';
 import { NamedPage } from 'vj/misc/Page';
 import delay from 'vj/utils/delay';
diff --git a/packages/ui-default/pages/problem_submit.page.tsx b/packages/ui-default/pages/problem_submit.page.tsx
index e365892e..8e9ce821 100644
--- a/packages/ui-default/pages/problem_submit.page.tsx
+++ b/packages/ui-default/pages/problem_submit.page.tsx
@@ -5,6 +5,10 @@ import getAvailableLangs from 'vj/utils/availableLangs';
 
 const page = new NamedPage(['problem_submit', 'contest_detail_problem_submit', 'homework_detail_problem_submit'], async () => {
   const { config } = UiContext.pdoc;
+  if (config.type === 'submit_answer') {
+    $('[name="lang"]').val('_');
+    return;
+  }
   const availableLangs = getAvailableLangs(config.langs);
   const mainLangs = {};
   const preferences = [($('[name="lang"]').val() as string) || ''];
diff --git a/packages/ui-default/templates/problem_submit.html b/packages/ui-default/templates/problem_submit.html
index ae0952ce..b982a86c 100644
--- a/packages/ui-default/templates/problem_submit.html
+++ b/packages/ui-default/templates/problem_submit.html
@@ -12,7 +12,7 @@
           <div class="hasjs--hide">
             {{ form.form_select({
                 label:'Code language',
-                options:model.setting.SETTINGS_BY_KEY['codeLang'].range,
+                options:langRange,
                 name:'lang',
                 value:handler.user.codeLang
               }) }}