Add localization support for new features and update existing translations

- Added "unknown" status to model states in English and Chinese locales.
- Introduced new actions for checking updates and support in both locales.
- Added settings for Civitai API key with help text in both locales.
- Updated context menus and control components to use localized strings.
- Enhanced help and support modals with localization.
- Updated update modal to reflect current and new version information in localized format.
- Refactored various templates to utilize the translation function for better internationalization.

templates/components/header.html

@@ -42,23 +42,23 @@
     <div class="header-actions">
       <!-- Integrated corner controls -->
       <div class="header-controls">
-        <div class="theme-toggle" data-i18n="header.theme.toggle" data-i18n-target="title" title="Toggle theme">
+        <div class="theme-toggle" title="{{ t('header.theme.toggle') }}">
           <i class="fas fa-moon dark-icon"></i>
           <i class="fas fa-sun light-icon"></i>
           <i class="fas fa-adjust auto-icon"></i>
         </div>
-        <div class="settings-toggle" title="Settings">
+        <div class="settings-toggle" title="{{ t('common.actions.settings') }}">
           <i class="fas fa-cog"></i>
         </div>
-        <div class="help-toggle" id="helpToggleBtn" title="Help & Tutorials">
+        <div class="help-toggle" id="helpToggleBtn" title="{{ t('common.actions.help') }}">
           <i class="fas fa-question-circle"></i>
           <span class="update-badge"></span>
         </div>
-        <div class="update-toggle" id="updateToggleBtn" title="Check Updates">
+        <div class="update-toggle" id="updateToggleBtn" title="{{ t('header.actions.checkUpdates') }}">
           <i class="fas fa-bell"></i>
           <span class="update-badge"></span>
         </div>
-        <div class="support-toggle" id="supportToggleBtn" title="Support">
+        <div class="support-toggle" id="supportToggleBtn" title="{{ t('header.actions.support') }}">
           <i class="fas fa-heart"></i>
         </div>
       </div>