Edit: Sheet has been updated. The sheet is saying 3 languages for a 16 int. So I think the calc is off.
Rolls
Language 1 - (1d19)
(6) = 6
Language 2 - (1d19)
(13) = 13
Language 3 - (1d19)
(3) = 3
Language 1 - (1d19)
(6) = 6
Language 2 - (1d19)
(13) = 13
Language 3 - (1d19)
(3) = 3