I saw that some langauges add stats while looking through, and wanted to suggest moving the stat increases to being able to read and write in that language (since most medieval royalty couldn't read!). The normal spoken trait acts like it does now, quick to get if you have a courier and gives a nice opinion bonus, but then you have the oppurtunity to learn how to write that language over the course of 5-20 years for the stat bonuses as well.