Translating menu/cards is piece of cake. But there are character lines that vary by situation, which are quite funny. From my WiFi experience, even though people have access to all 100 cards translations, they tend to screw up quite often. And unable to see NPC lines takes some fun out of the game. I got 24 trophies, ALL of them gold (only have 777 award left) got ~95 costumes, 2 tour modes left at something like 27 hours of gameplay.
My girlfriend however suffered greatly even though I was translating real time right next to her while multi card playing, and apparently she stopped playing because she thought not being able to understand make it less enjoyable.