XD well, it would be a challenge if he kicked his pokegear across the room and said "SCREW YOU GUYS, I'M GETTING ICE CREAM" and everyone else is like "Nani?" But there's always getting your pokegear fixed, or finding someone who knows both languages. Or stupidly screaming slowly. The translator would most likely be on automatically unless the character decided he didn't want it and switched the settings to "Off".

Don't worry, when we settle on something, we'll fix all the kinks.

It was originally there for the feeling of the full jamjar effect, though it may possibly deal with a plot. After all, I can get pretty oddly creative if I have to.