The idea of loads of people that cannot communicate with each other because they all speak different languages and only you can translate for them is fantastic. You could make it so rather than collecting speech bubbles, they all could be saying actual text but it appears as english to you, but you have to read what they say and then tell their designated recipient what they told you (select from a list of dialog options each with varying information but only 1 that's correct).
With a bit of polish this could be amazing. Nice work!