Simplify control language and theme labels

public/assets/app.js

@@ -117,10 +117,6 @@
             translateButton: 'Translate',
             themeButton: 'Theme',
             rebootButton: 'Reboot',
-            themeDark: 'Theme: Dark',
-            themeLight: 'Theme: Light',
-            langEn: 'Translate: EN',
-            langKo: 'Translate: KO',
             dialogAlert: 'Alert',
             dialogConfirm: 'Confirm',
             dialogInput: 'Input',
@@ -254,10 +250,6 @@
             translateButton: '번역',
             themeButton: '테마',
             rebootButton: '재부팅',
-            themeDark: '테마: 다크',
-            themeLight: '테마: 라이트',
-            langEn: '번역: EN',
-            langKo: '번역: KO',
             dialogAlert: '알림',
             dialogConfirm: '확인',
             dialogInput: '입력',
@@ -372,7 +364,7 @@
         if (themeMeta) {
             themeMeta.content = state.theme === 'light' ? '#f4f7fb' : '#0f1115';
         }
-        els.themeBtn && (els.themeBtn.textContent = state.theme === 'dark' ? t('themeDark') : t('themeLight'));
+        els.themeBtn && (els.themeBtn.textContent = t('themeButton'));
     }
 
     function applyLang(lang) {
@@ -382,8 +374,8 @@
         document.querySelectorAll('[data-i18n]').forEach(node => {
             node.textContent = t(node.dataset.i18n);
         });
-        els.translateBtn && (els.translateBtn.textContent = state.lang === 'ko' ? t('langKo') : t('langEn'));
-        els.themeBtn && (els.themeBtn.textContent = state.theme === 'dark' ? t('themeDark') : t('themeLight'));
+        els.translateBtn && (els.translateBtn.textContent = t('translateButton'));
+        els.themeBtn && (els.themeBtn.textContent = t('themeButton'));
         els.rebootBtn && (els.rebootBtn.textContent = t('rebootButton'));
         if (els.dmesgToggle) {
             els.dmesgToggle.textContent = state.dmesgOpen ? t('hide') : t('show');