diff --git a/packages/hydrooj/bin/commands.ts b/packages/hydrooj/bin/commands.ts
index 63e1ab46..125b0d96 100644
--- a/packages/hydrooj/bin/commands.ts
+++ b/packages/hydrooj/bin/commands.ts
@@ -1,13 +1,16 @@
-import child, { execSync } from 'child_process';
+import child from 'child_process';
 import os from 'os';
 import path from 'path';
 import cac from 'cac';
 import fs from 'fs-extra';
+import superagent from 'superagent';
+import tar from 'tar';
 
 const argv = cac().parse();
-let isGlobal = null;
+let yarnVersion = 0;
 try {
-    isGlobal = __dirname.startsWith(execSync('yarn global dir').toString().trim());
+    // eslint-disable-next-line no-unsafe-optional-chaining
+    yarnVersion = +child.execSync('yarn --version', { cwd: os.tmpdir() }).toString().split('v').pop()!.split('.')[0];
 } catch (e) {
     // yarn 2 does not support global dir
 }
@@ -124,14 +127,35 @@ if (!argv.args[0] || argv.args[0] === 'cli') {
         console.log('Current Addons: ', addons);
         fs.writeFileSync(addonPath, JSON.stringify(addons, null, 2));
     });
-    cli.command('install [package]').action((name) => {
-        if (!isGlobal) {
-            console.warn('This is not a global installation, unable to install.');
-            return;
-        }
-        // TODO support install from tarball
-        child.execSync(`yarn global install '${name}'`, { stdio: 'inherit' });
-        child.execSync(`hydrooj addon add '${name}'`);
+    cli.command('install [package]').action(async (src) => {
+        if (yarnVersion !== 1) throw new Error('Yarn 1 is required.');
+        const addonDir = path.join(hydroPath, 'addons');
+        let newAddonPath: string = '';
+        fs.ensureDirSync(addonDir);
+        // TODO: install from npm and check for update
+        if (src.startsWith('http')) {
+            const url = new URL(src);
+            const filename = url.pathname.split('/').pop()!;
+            if (['.tar.gz', '.tgz', '.zip'].find((i) => filename.endsWith(i))) {
+                const name = filename.replace(/(-?\d+\.\d+\.\d+)?(\.tar\.gz|\.zip|\.tgz)$/g, '');
+                newAddonPath = path.join(addonDir, name);
+                console.log(`Downloading ${src} to ${newAddonPath}`);
+                fs.ensureDirSync(newAddonPath);
+                await new Promise((resolve, reject) => {
+                    superagent.get(src)
+                        .pipe(tar.x({
+                            C: newAddonPath,
+                            strip: 1,
+                        }))
+                        .on('finish', resolve)
+                        .on('error', reject);
+                });
+            } else throw new Error('Unsupported file type');
+        } else throw new Error('Unsupported install schema');
+        if (!newAddonPath) throw new Error('Addon download failed');
+        console.log('Installing depedencies');
+        child.execSync('yarn --production', { stdio: 'inherit', cwd: newAddonPath });
+        child.execSync(`hydrooj addon add '${newAddonPath}'`);
     });
     cli.help();
     cli.parse();
diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 80d6fbd4..f5435002 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -52,6 +52,7 @@
         "semver": "^7.3.8",
         "serialize-javascript": "^6.0.0",
         "superagent": "^8.0.3",
+        "tar": "^6.1.12",
         "thirty-two": "^1.0.2",
         "ws": "^8.10.0"
     },
@@ -72,6 +73,7 @@
         "@types/semver": "^7.3.13",
         "@types/serialize-javascript": "^5.0.2",
         "@types/superagent": "^4.1.15",
+        "@types/tar": "^6.1.3",
         "moment": "^2.29.4"
     }
 }
diff --git a/packages/hydrooj/src/lib/validator.ts b/packages/hydrooj/src/lib/validator.ts
index fd85c7cd..277a0741 100644
--- a/packages/hydrooj/src/lib/validator.ts
+++ b/packages/hydrooj/src/lib/validator.ts
@@ -3,7 +3,6 @@ import { ValidationError } from '../error';
 const RE_UID = /^-?\d+$/i;
 const RE_DOMAINID = /^[a-zA-Z][a-zA-Z0-9_]{3,31}$/i;
 const RE_PID = /^[a-zA-Z]+[a-zA-Z0-9]*$/i;
-const RE_UNAME = /^.{3,31}$/i;
 const RE_ROLE = /^[_0-9A-Za-z]{1,31}$/i;
 const RE_MAIL = /^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)+$/i;
 
@@ -13,8 +12,6 @@ export const isDomainId = (s) => RE_DOMAINID.test(s);
 export const checkDomainId = (s) => { if (!isDomainId(s)) throw new ValidationError('domainId'); else return s; };
 export const isUid = (s) => RE_UID.test(s);
 export const checkUid = (s) => { if (!isUid(s)) throw new ValidationError('uid'); else return s; };
-export const isUname = (s) => RE_UNAME.test(s);
-export const checkUname = (s) => { if (!isUname(s)) throw new ValidationError('uname'); else return s; };
 export const isRole = (s) => RE_ROLE.test(s);
 export const checkRole = (s) => { if (!isRole(s)) throw new ValidationError('role'); else return s; };
 export const isPassword = (s) => s.length >= 5;
@@ -37,8 +34,6 @@ global.Hydro.lib.validator = {
     checkDomainId,
     isUid,
     checkUid,
-    isUname,
-    checkUname,
     isRole,
     checkRole,
     isPassword,
diff --git a/packages/hydrooj/src/model/contest.ts b/packages/hydrooj/src/model/contest.ts
index b2a3f179..0845f7da 100644
--- a/packages/hydrooj/src/model/contest.ts
+++ b/packages/hydrooj/src/model/contest.ts
@@ -298,15 +298,15 @@ const oi = buildContestRule({
         const udict = await user.getList(tdoc.domainId, uids);
         const psdict = {};
         const first = {};
-        for (const pid of tdoc.pids) {
-            // eslint-disable-next-line @typescript-eslint/no-use-before-define, no-await-in-loop
+        await Promise.all(tdoc.pids.map(async (pid) => {
+            // eslint-disable-next-line @typescript-eslint/no-use-before-define
             const [data] = await getMultiStatus(tdoc.domainId, {
                 docType: document.TYPE_CONTEST,
                 docId: tdoc.docId,
                 [`detail.${pid}.status`]: STATUS.STATUS_ACCEPTED,
             }).sort({ [`detail.${pid}.rid`]: 1 }).limit(1).toArray();
             first[pid] = data ? data.detail[pid].rid.generationTime : new ObjectID().generationTime;
-        }
+        }));
         // eslint-disable-next-line @typescript-eslint/no-use-before-define
         if (isDone(tdoc)) {
             const psdocs = await Promise.all(
diff --git a/packages/login-with-github/index.ts b/packages/login-with-github/index.ts
index 4625cf07..377f822f 100644
--- a/packages/login-with-github/index.ts
+++ b/packages/login-with-github/index.ts
@@ -76,4 +76,7 @@ export function apply(ctx: Context) {
         callback,
         get,
     });
+    ctx.i18n.load('zh', {
+        'Login With Github': '使用 Github 登录',
+    });
 }
diff --git a/packages/login-with-github/locales/zh.yaml b/packages/login-with-github/locales/zh.yaml
deleted file mode 100644
index d12c4f7d..00000000
--- a/packages/login-with-github/locales/zh.yaml
+++ /dev/null
@@ -1 +0,0 @@
-Login With Github: 使用 Github 登录
\ No newline at end of file
diff --git a/packages/login-with-google/index.ts b/packages/login-with-google/index.ts
index 7e94bcb0..ff1da8ae 100644
--- a/packages/login-with-google/index.ts
+++ b/packages/login-with-google/index.ts
@@ -78,4 +78,7 @@ export function apply(ctx: Context) {
         callback,
         get,
     });
+    ctx.i18n.load('zh', {
+        'Login With Google': '使用 Google 登录',
+    });
 }
diff --git a/packages/login-with-google/locales/zh.yaml b/packages/login-with-google/locales/zh.yaml
deleted file mode 100644
index c56e260e..00000000
--- a/packages/login-with-google/locales/zh.yaml
+++ /dev/null
@@ -1 +0,0 @@
-Login With Google: 使用 Google 登录
\ No newline at end of file
diff --git a/packages/migrate/index.ts b/packages/migrate/index.ts
index 6b3cf9db..41290268 100644
--- a/packages/migrate/index.ts
+++ b/packages/migrate/index.ts
@@ -9,6 +9,7 @@ export function apply(ctx: Context) {
     hustoj(ctx);
     vijos(ctx);
     syzoj(ctx);
+
     ctx.provideModule('hash', 'hust', ($password, $saved) => {
         $password = md5($password);
         if (RE_MD5.test($saved)) return $password === $saved;
@@ -27,4 +28,10 @@ export function apply(ctx: Context) {
         return `${Buffer.from(uname).toString('base64')}|${mixedSha1}`;
     });
     ctx.provideModule('hash', 'syzoj', (password: string) => md5(`${password}syzoj2_xxx`));
+
+    ctx.i18n.load('zh', {
+        'migrate from hustoj': '从 HustOJ 导入',
+        'migrate from vijos': '从 Vijos 导入',
+        'migrate from syzoj': '从 SYZOJ 导入',
+    });
 }
diff --git a/packages/migrate/locale/zh.yaml b/packages/migrate/locale/zh.yaml
deleted file mode 100644
index 915ee05a..00000000
--- a/packages/migrate/locale/zh.yaml
+++ /dev/null
@@ -1,2 +0,0 @@
-migrate from hustoj: 从 HustOJ 导入
-migrate from vijos: 从 Vijos 导入
\ No newline at end of file
diff --git a/packages/recaptcha/index.ts b/packages/recaptcha/index.ts
index 04db12dc..aa3868aa 100644
--- a/packages/recaptcha/index.ts
+++ b/packages/recaptcha/index.ts
@@ -15,7 +15,7 @@ export function apply(ctx: Context) {
             .field('secret', SystemModel.get('recaptcha.secret'))
             .field('response', thisArg.args.captcha)
             .field('remoteip', thisArg.request.ip);
-        if (!response.body.success) throw new ForbiddenError('captcha fail');
+        if (!response.body.success) throw new ForbiddenError('Failed to solve the captcha.');
     });
 
     ctx.on('handler/after/UserRegister', async (thisArg) => {
@@ -24,4 +24,8 @@ export function apply(ctx: Context) {
 <input type="text" name="captcha" id="_captcha" style="display:none">
 <input type="submit" id="_submit" style="display:none">`;
     });
+
+    ctx.i18n.load('zh', {
+        'Failed to solve the captcha': '没有通过 ReCaptcha 验证。',
+    });
 }
diff --git a/packages/recaptcha/locale/zh.yaml b/packages/recaptcha/locale/zh.yaml
deleted file mode 100644
index 8979369c..00000000
--- a/packages/recaptcha/locale/zh.yaml
+++ /dev/null
@@ -1 +0,0 @@
-captcha fail: 您没有通过 Recaptcha 验证。
\ No newline at end of file
diff --git a/packages/sonic/index.ts b/packages/sonic/index.ts
index 563c6669..ea6f6756 100644
--- a/packages/sonic/index.ts
+++ b/packages/sonic/index.ts
@@ -92,4 +92,8 @@ export function apply(ctx: Context) {
         }),
         run,
     );
+
+    ctx.i18n.load('zh', {
+        'Sonic problem search re-index': '重建题目搜索索引。',
+    });
 }
diff --git a/packages/sonic/locale/zh.yaml b/packages/sonic/locale/zh.yaml
deleted file mode 100644
index 39efcc53..00000000
--- a/packages/sonic/locale/zh.yaml
+++ /dev/null
@@ -1 +0,0 @@
-Sonic problem search re-index: 重建题目搜索索引。