I am not sure if this is a bug but as the Spring update just arrived I thought it is best to report it just to be sure.
Trying to make a new Spy, the character cannot choose Spy's Codebook language. I added a screenshot to the Imgur link (the inserting of image would not work from the text editor for some reason). EDIT: I figured out how to show the image after all so here it is without the link. Also sorry for small size, it gets bigger apparently if opened in new tab but you probably knew that already.
Hope this could shed light on the issue. :)