Updated language files
Cleaned up old language files
Removed useless files

Some of those files are not used anymore.

Also, updated camera, colour and physical properties context menus to
use new language format.
Updated tools to reflect language changes
Updated Utilities tab with new language changes

Added more sandbox settings into Utilities > Admin > Settings
Further language consistency

* Updated language files
* Added hints/help for undo and cleanup in Utilities tab
* Added translations for server settings
* Fixed keybind translation for light tool
Merge pull request #559 from robotboy655/language

Further update tools to the new language system