a800: add fwt support, fix UI overlay colors.
Tested by koshy: http://chdk.setepontos.com/index.php?topic=11831.msg118292#msg118292
a1000: fix fwt and UI overlay colors
Tested by koshy: http://chdk.setepontos.com/index.php?topic=11831.msg118311#msg118311
Cleanup language files:
- remove entries that not longer exist in CHDK
- remove extra blank lines