It appears as though we should start with Portuguese, Romanian, German, Dutch or Polish - the five most common countries in question that uses the Alphabet we use and the majority of the countries that don't speak English.
I agree. Well, still maybe there are more Portuguese (for example) members than Brazillian for example. The translated forums would increase activity on these countries. (Sorry if I sound confusing, today's not my day to explain stuff.)
@ Chris: What's up with 'Portuga'?
@ Highwire: That'd require someone to translate the whole forum or download some translations. Translating every single php entry on the forums is a time hogger.