增加i18n支持

src/components/Navbar.astro

@@ -44,14 +44,14 @@ import ThemeSwitcher from "./ThemeSwitcher.vue";
         th:if="${pluginFinder.available('PluginSearchWidget') and theme.config?.navbar?.navbar_show_search != false}"
         class="wi-navbar__action-btn"
         type="button"
-        th:aria-label="${theme.config?.basic?.label_search ?: '搜索'}"
+        th:aria-label="${theme.config?.basic?.label_search ?: #messages.msg('common.search')}"
         onclick="SearchWidget.open()"
       >
         <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="11" cy="11" r="8"/><path d="m21 21-4.3-4.3"/></svg>
       </button>
 
       <th:block th:if="${theme.config?.navbar?.navbar_show_theme_switch != false}">
-        <span th:attr="data-label=${theme.config?.basic?.label_theme_switch ?: '切换主题'}" style="display:inline-flex">
+        <span th:attr="data-label=${theme.config?.basic?.label_theme_switch ?: #messages.msg('common.themeSwitch')}" style="display:inline-flex">
           <ThemeSwitcher client:idle />
         </span>
       </th:block>