language chooser

Hi, I'd like to know how to disable the language chooser completely for members from the footer part, account preference settings etc. I want everyone to use the secondary/child language as it contains modified phrases for. I've searched the forum & found some instructions - but they are...

Title says it all. When editing a post you get the modal. If you click on "more" and get to the actual edit page, the style chooser button and the language chooser button are gone on default style. I recognized the same with UIX, but there the language chooser remains and only the style chooser...