B767 FLT CREW RPTED A MAIN CARGO FIRE WARNING ON TKOF; DECLARED AN EMER; AND DIVERTED TO RJAA.

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ON TKOF FROM KIX; WE RECEIVED A MOMENTARY MAIN CARGO FIRE WARNING. THIS INCLUDED AN EICAS MESSAGE; FIRE BELL; AND FIRE LIGHTS AT 80 KTS ON TKOF ROLL. THIS WARNING WAS EXTREMELY BRIEF; IT QUICKLY EXTINGUISHED. ONCE AIRBORNE AND IN CRUISE FLT; WE COORDINATED WITH OUR COMPANY DISPATCHER VIA ACARS; AND THE DECISION WAS MADE TO DIVERT TO TOKYO (NARITA) ARPT. WE DECLARED AN EMER; DUMPED AS MUCH FUEL AS POSSIBLE; AND THEN MADE AN OVERWT LNDG WITHOUT ANY INCIDENT. AFTER LNDG; THE MAIN CARGO FIRE WARNING ILLUMINATED AGAIN; AND REMAINED ON UNTIL THE ACFT WAS SHUT DOWN AND SECURED. DUE TO THE LANGUAGE BARRIERS OF BEING IN THE JAPAN ATC SYS; COMMUNICATING OUR ABNORMAL SIT WAS NEARLY IMPOSSIBLE. IT TOOK OVER '6 XMISSIONS' TO GET THEM TO UNDERSTAND THAT WE WERE DECLARING AN EMER AND THAT WE NEEDED TO LAND ASAP. MOST IMPORTANTLY; ONCE WE LANDED; IT WAS IMPOSSIBLE TO TALK WITH THE FIRE CREWS. WE COULD NOT UNDERSTAND THEM; AND THEY COULD NOT SPEAK ANY ENGLISH. THEREFORE; THE SIT BECAME VERY HECTIC AND CHAOTIC. NOT BEING ABLE TO COMMUNICATE CLRLY WITH ATC OR THE CRAFF PERSONNEL WOULD'VE MADE THIS A VERY DIRE SIT; HAD WE BEEN ON FIRE.