Function to convert UCS-2 to UTF-8
can also be used to convert UNICODE entry point from U+0000 to U+FFFF
and is ready to be converted, if needed, for UNICODE entry point from U+100000 to U+10FFFF (bigger are not valid on UNICODE)
http://forum.mikrotik.com/t/convert-any-text-to-unicode/164329/18