This field in the Score lists the current languages that your character is able to speak. The one which is currently selected as the one which will be used is marked in red, the rest are the default color for the score.
All players start with the common tongue, and many players will only use that one throughout their entire play time. Additional languages can be learned by players with the Scholar talent, and currently include:
A player who is speaking in a language you do not currently know will have their text scrambled so to be unintelligible.
The syntax for changing languages is: