Make updating your preferred language faster.
Currently if a user wants to update his/her preferred language it can take up to 24 hours to be applied.
Usually it is new users that have to do this and it doesn't help to convince them that this is a modern platform.
In an easy world you can prefill the language for the user or script it but this is not always possible in real world scenario's.
It shouldn't be that hard to apply this instantly.