WIP: сборка английской версии mdbook

.github/theme/language-switcher.css

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+/* ── Language Switcher ───────────────────────────────────────────────────── */
+
+#language-switcher {
+  display:     inline-flex;
+  align-items: center;
+  gap:         4px;
+
+  background:  none;
+  border:      1px solid var(--icons);
+  border-radius: 4px;
+  color:       var(--icons);
+  cursor:      pointer;
+  font-size:   0.82em;
+  font-weight: 600;
+  line-height: 1;
+  padding:     3px 8px;
+
+  /* sit nicely alongside the existing icon buttons */
+  margin-right: 4px;
+  vertical-align: middle;
+
+  transition: color 0.15s, border-color 0.15s, background 0.15s;
+}
+
+#language-switcher:hover,
+#language-switcher:focus-visible {
+  color:            var(--icons-hover);
+  border-color:     var(--icons-hover);
+  background-color: rgba(128, 128, 128, 0.08);
+  outline:          none;
+}
+
+/* Keep the flag emoji from being shrunk by the parent flex layout */
+#language-switcher span[aria-hidden] {
+  font-size: 1.1em;
+  line-height: 1;
+}
+
+/* Hide text label on very small screens, show only flag */
+@media (max-width: 420px) {
+  #language-switcher .lang-label {
+    display: none;
+  }
+}

.github/theme/language-switcher.js

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+(function () {
+  "use strict";
+
+  // Detects current language from the URL path.
+  // Russian lives at /APS/...  English lives at /APS/en/...
+  function currentLang() {
+    return /\/en\//.test(window.location.pathname) ? "en" : "ru";
+  }
+
+  function switchLanguage() {
+    var path = window.location.pathname;
+    var newPath;
+
+    if (currentLang() === "en") {
+      // /APS/en/foo/bar.html  →  /APS/foo/bar.html
+      newPath = path.replace("/en/", "/");
+    } else {
+      // /APS/foo/bar.html  →  /APS/en/foo/bar.html
+      // Insert "en/" after the first path segment (the repo root, e.g. /APS/)
+      newPath = path.replace(/^(\/[^\/]+\/)/, "$1en/");
+    }
+
+    window.location.href =
+      newPath + window.location.search + window.location.hash;
+  }
+
+  function addSwitcher() {
+    var lang = currentLang();
+
+    var btn = document.createElement("button");
+    btn.id = "language-switcher";
+    btn.setAttribute(
+      "title",
+      lang === "ru" ? "Switch to English" : "Переключить на русский"
+    );
+    btn.setAttribute("aria-label", btn.getAttribute("title"));
+
+    // Flag + label
+    var icon = document.createElement("span");
+    icon.setAttribute("aria-hidden", "true");
+    icon.textContent = lang === "ru" ? "🇬🇧" : "🇷🇺";
+
+    var label = document.createElement("span");
+    label.className = "lang-label";
+    label.textContent = lang === "ru" ? "EN" : "RU";
+
+    btn.appendChild(icon);
+    btn.appendChild(label);
+    btn.addEventListener("click", switchLanguage);
+
+    // mdBook places theme/print/search buttons in .right-buttons
+    var target = document.querySelector(".right-buttons");
+    if (target) {
+      target.insertBefore(btn, target.firstChild);
+    }
+  }
+
+  if (document.readyState === "loading") {
+    document.addEventListener("DOMContentLoaded", addSwitcher);
+  } else {
+    addSwitcher();
+  }
+})();