- Add _() translation function to add_tablet.html, add_user.html, loan_tablet.html
- Add _() translation function to add_non_loanable_device.html, edit_non_loanable_device.html
- Add _() translation function to history.html, non_loanable_devices.html, project_management.html
- Update app.py to use cookie-based language persistence with 1-year expiry
- Add /set_language endpoint to handle language switching with cookie + session
- Update language switcher in base.html to use new endpoint
- Set Spanish (es) as default language for internal app
- Import make_response and session from Flask
- Add mobile-first responsive CSS to base.html
- Wrap all tables in .table-container for horizontal scrolling on mobile
- Add breakpoints for phones (576px), tablets (768px), desktops (992px, 1200px)
- Improve mobile navigation (vertical stack) and form layouts (full-width)
- Add print styles for clean printing
- Update project_management.html editor for mobile
- Document all changes in docs/RESPONSIVE_CSS.md
No backend or JavaScript changes - pure CSS solution.
For 5 internal technical users, this is simpler and more appropriate than
HTMX or SPA approaches. Solves mobile accessibility issue with minimal changes.
