[refactor / bugfix] language - sort JSON keys, find missing keys

[MichaelWheeley]

What does this PR do?

I have been working to add TH language (pending) however it is a moving target. Between languages there appeared to be an inconsistent sort of indexing of JSON keys making identification of new or missing keys difficult. For each language I have sorted alphabetically, and where missing keys occur added them using the 'en' language version as master.

Type of change

• Bug fix
• New feature
• Performance improvement
• Refactor / code cleanup
• Documentation
• Translation
• Map layer plugin

How to test

1. Performed quick validation by loading each language from settings menu and visually verifying language load occurs.

Checklist

• App loads without console errors
• Tested in Dark, Light, and Retro themes
• Responsive at different screen sizes (desktop + mobile)
• If touching server.js: caches have TTLs and size caps (we serve 2,000+ concurrent users)
• If adding an API route: includes caching and error handling
• If adding a panel: wired into Modern, Classic, and Dockable layouts
• No hardcoded colors — uses CSS variables (var(--accent-cyan), etc.)
• No .bak, .old, console.log debug lines, or test scripts included

Screenshots (if visual change)

(none)