enhance(frontend): サーバーエラー画面の多言語対応 (#15549)

* enhance(frontend): サーバーエラー画面の多言語対応

* indent

packages/backend/src/server/web/error.js

@@ -0,0 +1,40 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+'use strict';
+
+(() => {
+	document.addEventListener('DOMContentLoaded', () => {
+		const locale = JSON.parse(localStorage.getItem('locale') || '{}');
+
+		const messages = Object.assign({
+			title: 'Failed to initialize Misskey',
+			serverError: 'If reloading after a period of time does not resolve the problem, contact the server administrator with the following ERROR ID.',
+			solution: 'The following actions may solve the problem.',
+			solution1: 'Update your os and browser',
+			solution2: 'Disable an adblocker',
+			solution3: 'Clear the browser cache',
+			solution4: '(Tor Browser) Set dom.webaudio.enabled to true',
+			otherOption: 'Other options',
+			otherOption1: 'Clear preferences and cache',
+			otherOption2: 'Start the simple client',
+			otherOption3: 'Start the repair tool',
+		}, locale?._bootErrors || {});
+		const reload = locale?.reload || 'Reload';
+
+		const reloadEls = document.querySelectorAll('[data-i18n-reload]');
+		for (const el of reloadEls) {
+			el.textContent = reload;
+		}
+
+		const i18nEls = document.querySelectorAll('[data-i18n]');
+		for (const el of i18nEls) {
+			const key = el.dataset.i18n;
+			if (key && messages[key]) {
+				el.textContent = messages[key];
+			}
+		}
+	});
+})();