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Pedro Brito
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feat(i18n): add Brazilian Portuguese (pt-BR) language module
- Localized all UI text labels, stats counters, tooltips, dialogs, and placeholders in script.js. - Added language selection dropdown options for pt-BR in index.html (both desktop and mobile menus). - Registered pt-BR hreflang metadata alternate link in index.html for SEO indexation. - Enabled automatic language detection fallback for Portuguese language preferences. - Rotated Service Worker cache namespace to v3.6.4 in sw.js. - Synced offline-ready desktop-app compiled resources using prepare.js.
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‎CHANGELOG.md‎

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All notable code changes to **Markdown Viewer** are documented here.
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Non-code commits (documentation, planning, README-only updates) are excluded.
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## v3.6.4
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- **Description:** Implemented Brazilian Portuguese (pt-BR) translation module. Localized all main editor labels, stats, tooltips, dialogs, placeholder, and search/replace options. Registered `hreflang` alternate link for Portuguese (pt-BR) search indexation and enabled automatic browser language detection fallback for Portuguese language preferences. Rotated Service Worker cache namespace to `v3.6.4` to trigger background cache updates.
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- **Date:** 2026-05-27
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- **URL:** https://github.com/ThisIs-Developer/Markdown-Viewer/commit/v3.6.4
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---
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## v3.6.3

‎desktop-app/resources/index.html‎

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<link rel="alternate" hreflang="zh-Hans" href="https://markdownviewer.pages.dev/?lang=zh" />
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<link rel="alternate" hreflang="ja" href="https://markdownviewer.pages.dev/?lang=ja" />
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<link rel="alternate" hreflang="ko" href="https://markdownviewer.pages.dev/?lang=ko" />
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<link rel="alternate" hreflang="pt-BR" href="https://markdownviewer.pages.dev/?lang=pt" />
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<!-- Asian Search Engine Verification Meta Tags -->
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<meta name="baidu-site-verification" content="baidu_verification_code_placeholder" />
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="zh">🇨🇳 简体中文</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="ja">🇯🇵 日本語</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="ko">🇰🇷 한국어</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="pt">🇧🇷 Português (Brasil)</a></li>
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</ul>
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</div>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="zh">🇨🇳 简体中文</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="ja">🇯🇵 日本語</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="ko">🇰🇷 한국어</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="pt">🇧🇷 Português (Brasil)</a></li>
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</ul>
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</div>
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<button id="mobile-theme-toggle" class="mobile-menu-item" title="Toggle Dark Mode">

‎desktop-app/resources/js/script.js‎

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insertTable: "표 삽입",
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findReplace: "찾기 및 바꾸기",
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placeholder: "여기에 마크다운 내용을 입력하세요..."
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},
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pt: {
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title: "Visualizador de Markdown",
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syncOff: "Desativar Sincronia",
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syncOn: "Ativar Sincronia",
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import: "Importar",
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importFile: "De arquivos",
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importGithub: "Do GitHub",
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export: "Exportar",
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exportMd: "Markdown (.md)",
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exportHtml: "HTML",
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exportPdf: "PDF",
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copy: "Copiar",
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copied: "Copiado!",
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share: "Compartilhar",
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reset: "Redefinir",
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editor: "Editor",
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split: "Dividido",
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preview: "Visualizar",
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minRead: "Min de leitura",
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words: "Palavras",
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chars: "Caracteres",
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switchRtl: "Mudar para RTL",
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switchLtr: "Mudar para LTR",
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darkMode: "Modo Escuro",
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lightMode: "Modo Claro",
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helpTitle: "Ajuda do Visualizador de Markdown",
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aboutTitle: "Sobre o Markdown",
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shareTitle: "Compartilhar Documento",
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renameTitle: "Renomear arquivo",
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insertLink: "Inserir link",
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insertRef: "Inserir referência",
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insertImg: "Inserir imagem",
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insertTable: "Inserir tabela",
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findReplace: "Localizar & Substituir",
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placeholder: "Digite seu markdown aqui..."
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}
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};
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// Update dynamic current language labels in drop menus
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const labelEl = document.getElementById('current-lang-label');
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if (labelEl) {
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const flags = { en: "🇺🇸 English", zh: "🇨🇳 简体中文", ja: "🇯🇵 日本語", ko: "🇰🇷 한국어" };
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const flags = { en: "🇺🇸 English", zh: "🇨🇳 简体中文", ja: "🇯🇵 日本語", ko: "🇰🇷 한국어", pt: "🇧🇷 Português (Brasil)" };
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labelEl.textContent = flags[lang];
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}
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const mobileLabelEl = document.getElementById('mobile-current-lang-label');
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if (mobileLabelEl) {
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const flags = { en: "🇺🇸 English", zh: "🇨🇳 简体中文", ja: "🇯🇵 日本語", ko: "🇰🇷 한국어" };
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const flags = { en: "🇺🇸 English", zh: "🇨🇳 简体中文", ja: "🇯🇵 日本語", ko: "🇰🇷 한국어", pt: "🇧🇷 Português (Brasil)" };
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mobileLabelEl.textContent = flags[lang];
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}
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if (navLang.startsWith('zh')) lang = 'zh';
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else if (navLang.startsWith('ja')) lang = 'ja';
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else if (navLang.startsWith('ko')) lang = 'ko';
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else if (navLang.startsWith('pt')) lang = 'pt';
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}
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if (!lang || !I18N_DICTS[lang]) {

‎index.html‎

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<link rel="alternate" hreflang="zh-Hans" href="https://markdownviewer.pages.dev/?lang=zh" />
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<link rel="alternate" hreflang="ja" href="https://markdownviewer.pages.dev/?lang=ja" />
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<link rel="alternate" hreflang="ko" href="https://markdownviewer.pages.dev/?lang=ko" />
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<link rel="alternate" hreflang="pt-BR" href="https://markdownviewer.pages.dev/?lang=pt" />
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<!-- Asian Search Engine Verification Meta Tags -->
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<meta name="baidu-site-verification" content="baidu_verification_code_placeholder" />
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="zh">🇨🇳 简体中文</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="ja">🇯🇵 日本語</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="ko">🇰🇷 한국어</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="pt">🇧🇷 Português (Brasil)</a></li>
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</ul>
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</div>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="zh">🇨🇳 简体中文</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="ja">🇯🇵 日本語</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="ko">🇰🇷 한국어</a></li>
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<li><a class="dropdown-item lang-select-item" href="#" data-lang="pt">🇧🇷 Português (Brasil)</a></li>
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</ul>
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</div>
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<button id="mobile-theme-toggle" class="mobile-menu-item" title="Toggle Dark Mode">

‎script.js‎

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insertTable: "표 삽입",
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findReplace: "찾기 및 바꾸기",
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placeholder: "여기에 마크다운 내용을 입력하세요..."
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},
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pt: {
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title: "Visualizador de Markdown",
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syncOff: "Desativar Sincronia",
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syncOn: "Ativar Sincronia",
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import: "Importar",
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importFile: "De arquivos",
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importGithub: "Do GitHub",
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export: "Exportar",
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exportMd: "Markdown (.md)",
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exportHtml: "HTML",
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exportPdf: "PDF",
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copy: "Copiar",
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copied: "Copiado!",
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share: "Compartilhar",
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reset: "Redefinir",
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editor: "Editor",
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split: "Dividido",
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preview: "Visualizar",
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minRead: "Min de leitura",
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words: "Palavras",
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chars: "Caracteres",
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switchRtl: "Mudar para RTL",
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switchLtr: "Mudar para LTR",
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darkMode: "Modo Escuro",
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lightMode: "Modo Claro",
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helpTitle: "Ajuda do Visualizador de Markdown",
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aboutTitle: "Sobre o Markdown",
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shareTitle: "Compartilhar Documento",
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renameTitle: "Renomear arquivo",
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insertLink: "Inserir link",
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insertRef: "Inserir referência",
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insertImg: "Inserir imagem",
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insertTable: "Inserir tabela",
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findReplace: "Localizar & Substituir",
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placeholder: "Digite seu markdown aqui..."
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}
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};
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// Update dynamic current language labels in drop menus
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const labelEl = document.getElementById('current-lang-label');
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if (labelEl) {
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const flags = { en: "🇺🇸 English", zh: "🇨🇳 简体中文", ja: "🇯🇵 日本語", ko: "🇰🇷 한국어" };
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const flags = { en: "🇺🇸 English", zh: "🇨🇳 简体中文", ja: "🇯🇵 日本語", ko: "🇰🇷 한국어", pt: "🇧🇷 Português (Brasil)" };
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labelEl.textContent = flags[lang];
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}
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const mobileLabelEl = document.getElementById('mobile-current-lang-label');
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if (mobileLabelEl) {
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const flags = { en: "🇺🇸 English", zh: "🇨🇳 简体中文", ja: "🇯🇵 日本語", ko: "🇰🇷 한국어" };
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const flags = { en: "🇺🇸 English", zh: "🇨🇳 简体中文", ja: "🇯🇵 日本語", ko: "🇰🇷 한국어", pt: "🇧🇷 Português (Brasil)" };
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mobileLabelEl.textContent = flags[lang];
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}
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if (navLang.startsWith('zh')) lang = 'zh';
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else if (navLang.startsWith('ja')) lang = 'ja';
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else if (navLang.startsWith('ko')) lang = 'ko';
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else if (navLang.startsWith('pt')) lang = 'pt';
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}
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if (!lang || !I18N_DICTS[lang]) {

‎sw.js‎

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const CACHE_NAME = 'markdown-viewer-cache-v3.6.3';
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const CACHE_NAME = 'markdown-viewer-cache-v3.6.4';
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const ASSETS = [
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'./',
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'./index.html',

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