feat: Complete Spanish, French, Portuguese, Chinese localization and add German/Italian support

- Updated all Spanish (es) translation files with comprehensive translations for tracking, AI, family, insights, children, and settings pages
- Updated French (fr), Portuguese (pt), and Chinese (zh) translations to match English structure
- Added German (de) and Italian (it) language support with complete translation files
- Fixed medicine tracker route from /track/medication to /track/medicine
- Updated i18n config to support 7 languages: en, es, fr, pt, zh, de, it
- All tracking pages now fully localized: sleep, feeding, diaper, medicine, activity
- AI assistant interface fully translated with thinking messages and suggested questions
- Family management and insights pages now support all languages

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

Co-Authored-By: Claude <noreply@anthropic.com>

maternal-web/app/track/page.tsx

@@ -60,7 +60,9 @@ export default function TrackPage() {
               <Grid item xs={12} sm={6} md={3} key={option.title}>
                 <Card
                   sx={{
-                    height: '100%',
+                    height: '180px', // Fixed height for consistency
+                    minHeight: '180px',
+                    width: '100%',
                     bgcolor: option.color,
                     '&:hover': {
                       transform: 'translateY(-4px)',