Fix language setting not being saved to database on admin settings page

- Added default_language field to general settings state in SettingsPage
- Replaced LanguageSelector component with simple select dropdown on settings page
- Fixed public settings endpoint to read general_default_language from database
- Language setting now properly saved when clicking Save Settings button
- Setting is correctly used by gallery login page and legal pages

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

backend/src/routes/publicCMS.js

@@ -0,0 +1,33 @@
+const express = require('express');
+const { db } = require('../database/db');
+const router = express.Router();
+
+// Get public CMS page
+router.get('/pages/:slug', async (req, res) => {
+  try {
+    const { slug } = req.params;
+    const { lang = 'en' } = req.query;
+    
+    const page = await db('cms_pages').where('slug', slug).first();
+    
+    if (!page) {
+      return res.status(404).json({ error: 'Page not found' });
+    }
+    
+    // Return the appropriate language version
+    const title = lang === 'de' ? page.title_de : page.title_en;
+    const content = lang === 'de' ? page.content_de : page.content_en;
+    
+    res.json({
+      title,
+      content,
+      slug: page.slug,
+      updated_at: page.updated_at
+    });
+  } catch (error) {
+    console.error('Error fetching public CMS page:', error);
+    res.status(500).json({ error: 'Failed to fetch page' });
+  }
+});
+
+module.exports = router;