Yiu can also kind of 'handwave' it away through techno-babble if you really want to as well.
Speech to text auto-translation through AR matrix support, AR lingosofts (not as hood as the chipped version, but hey, FREE!)... speech to speech AR translation.. the list goes on.
Keep in mind though, even in these countries where people speak 2 to 4 languages, some people still can't talk to each other ;P After all, just cause you speak english doesn't mean you speak English
