Add language and theme preferences

public/assets/wakelock.js

@@ -7,6 +7,10 @@
     let wakeLock = null;
     let wanted = false;
 
+    function tr(key, fallback) {
+        return typeof window.controlT === 'function' ? window.controlT(key) : fallback;
+    }
+
     function supported() {
         return 'wakeLock' in navigator;
     }
@@ -20,7 +24,7 @@
         button.disabled = !supported();
         button.classList.toggle('wake-active', isActive);
         button.textContent = 'WakeLock';
-        button.title = supported() ? '화면 꺼짐 방지' : '현재 브라우저에서 WakeLock을 지원하지 않습니다.';
+        button.title = supported() ? tr('wakeLockTitle', 'Prevent screen sleep') : tr('wakeLockUnsupported', 'WakeLock is not supported by this browser.');
     }
 
     async function requestWakeLock() {
@@ -57,7 +61,7 @@
             wakeLock = null;
             const alertFn = window.customAlert || (() => Promise.resolve());
             alertFn(error.message || 'WakeLock failed', {
-                title: 'WakeLock 오류',
+                title: tr('wakeLockErrorTitle', 'WakeLock Error'),
                 danger: true,
             });
             render();