BuddyPress.org

As much as I can tell, being one of those English-speaking imperialists to which you refer, WordPress has a good range of i18n stuff if developers use the right functions. If you think WordPress and BuddyPress seriously lack in these areas, then please by all means start a specific discussion thread on each product’s forums or file trac tickets/bug reports/patches.

Back on topic, I think socialpreneur’s on the money with this.