[refactor / language] settings updates language

[MichaelWheeley]

What does this PR do?

• reordered all languages using js -S
• BeyondCompare added any missing keys using en as master
• added new keys in units Distance, Temperature, Pressure
• renamed displayed phrase 'Imperial' as 'US Customary' since they are different
• various language updates for Thai in settings

Type of change

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

How to test

1. settings, vary language
2. all languages load no problem

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)