The three windows here list your Special Abilities that you've accumulated, your known Languages, and Weapon Proficiencies. Clicking on the Language Choose button brings up a pop-up window displaying your known languages at the bottom and the languages you can learn at the top. The available list is generated from the LANGBONUS: tags in the loaded race and class files. When you initially create your character the selected languages are generated from the LANGAUTO: tags in your race and class files.