diff --git a/packages/backend/eslint.config.js b/packages/backend/eslint.config.js
index 4fd9f0cd51..75ccce7b3d 100644
--- a/packages/backend/eslint.config.js
+++ b/packages/backend/eslint.config.js
@@ -1,5 +1,6 @@
 import tsParser from '@typescript-eslint/parser';
 import sharedConfig from '../shared/eslint.config.js';
+import globals from 'globals';
 
 export default [
 	...sharedConfig,
@@ -43,4 +44,15 @@ export default [
 			}],
 		},
 	},
+	{
+		files: ['src/server/web/**/*.js', 'src/server/web/**/*.ts'],
+		languageOptions: {
+			globals: {
+				...globals.browser,
+				LANGS: true,
+				CLIENT_ENTRY: true,
+				LANGS_VERSION: true,
+			},
+		},
+	},
 ];
diff --git a/packages/backend/src/server/web/bios.js b/packages/backend/src/server/web/bios.js
index 9ff5dca72a..5dbb26f9e3 100644
--- a/packages/backend/src/server/web/bios.js
+++ b/packages/backend/src/server/web/bios.js
@@ -6,36 +6,6 @@
 'use strict';
 
 window.onload = async () => {
-	const account = JSON.parse(localStorage.getItem('account'));
-	const i = account.token;
-
-	const api = (endpoint, data = {}) => {
-		const promise = new Promise((resolve, reject) => {
-			// Append a credential
-			if (i) data.i = i;
-
-			// Send request
-			window.fetch(endpoint.indexOf('://') > -1 ? endpoint : `/api/${endpoint}`, {
-				method: 'POST',
-				body: JSON.stringify(data),
-				credentials: 'omit',
-				cache: 'no-cache'
-			}).then(async (res) => {
-				const body = res.status === 204 ? null : await res.json();
-
-				if (res.status === 200) {
-					resolve(body);
-				} else if (res.status === 204) {
-					resolve();
-				} else {
-					reject(body.error);
-				}
-			}).catch(reject);
-		});
-
-		return promise;
-	};
-
 	const content = document.getElementById('content');
 
 	document.getElementById('ls').addEventListener('click', () => {
diff --git a/packages/backend/src/server/web/boot.embed.js b/packages/backend/src/server/web/boot.embed.js
index dfa23d3afd..b07dce3ac4 100644
--- a/packages/backend/src/server/web/boot.embed.js
+++ b/packages/backend/src/server/web/boot.embed.js
@@ -31,8 +31,17 @@
 		document.documentElement.classList.add('noborder');
 	}
 
+	// Force update when locales change
+	const langsVersion = LANGS_VERSION;
+	const localeVersion = localStorage.getItem('localeVersion');
+	if (localeVersion !== langsVersion) {
+		console.info(`Updating locales from version ${localeVersion ?? 'N/A'} to ${langsVersion}`);
+		localStorage.removeItem('localeVersion');
+		localStorage.removeItem('locale');
+	}
+
 	//#region Detect language & fetch translations
-	if (!localStorage.hasOwnProperty('locale')) {
+	if (!localStorage.getItem('locale')) {
 		const supportedLangs = LANGS;
 		let lang = localStorage.getItem('lang');
 		if (lang == null || !supportedLangs.includes(lang)) {
@@ -46,37 +55,17 @@
 			}
 		}
 
-		const metaRes = await window.fetch('/api/meta', {
-			method: 'POST',
-			body: JSON.stringify({}),
-			credentials: 'omit',
-			cache: 'no-cache',
-			headers: {
-				'Content-Type': 'application/json',
-			},
-		});
-		if (metaRes.status !== 200) {
-			renderError('META_FETCH');
-			return;
-		}
-		const meta = await metaRes.json();
-		const v = meta.version;
-		if (v == null) {
-			renderError('META_FETCH_V');
-			return;
-		}
-
 		// for https://github.com/misskey-dev/misskey/issues/10202
 		if (lang == null || lang.toString == null || lang.toString() === 'null') {
 			console.error('invalid lang value detected!!!', typeof lang, lang);
 			lang = 'en-US';
 		}
 
-		const localRes = await window.fetch(`/assets/locales/${lang}.${v}.json`);
+		const localRes = await window.fetch(`/assets/locales/${lang}.${langsVersion}.json`);
 		if (localRes.status === 200) {
 			localStorage.setItem('lang', lang);
 			localStorage.setItem('locale', await localRes.text());
-			localStorage.setItem('localeVersion', v);
+			localStorage.setItem('localeVersion', langsVersion);
 		} else {
 			renderError('LOCALE_FETCH');
 			return;
diff --git a/packages/backend/src/server/web/boot.js b/packages/backend/src/server/web/boot.js
index 9063358eaa..886e2f006e 100644
--- a/packages/backend/src/server/web/boot.js
+++ b/packages/backend/src/server/web/boot.js
@@ -88,7 +88,7 @@
 	const themeFontFaceName = 'sharkey-theme-font-face';
 	if (theme) {
 		let existingFontFace;
-		document.fonts.forEach((v,k,s)=>{if (v.family === themeFontFaceName) existingFontFace=v;});
+		document.fonts.forEach((v) => { if (v.family === themeFontFaceName) existingFontFace = v;});
 		if (existingFontFace) document.fonts.delete(existingFontFace);
 
 		const themeProps = JSON.parse(theme);
@@ -102,9 +102,8 @@
 			document.fonts.add(fontFace);
 			fontFace.load().catch(
 				(failure) => {
-					console.log(failure)
-				}
-			);
+					console.log(failure);
+				},			);
 		}
 		for (const [k, v] of Object.entries(themeProps)) {
 			if (k.startsWith('font')) continue;