Description of problem:
I added a read only user "reader" and assign "Read Everything" role.
when I login with reader and traversed  Administration ==> users ==> select any user on right tab, the User's details page lets me edit the user's browser locale


Steps to Reproduce:
1. Login with admin
2. create new user 'reader'
3. assign "read everything" role to reader
4. Login with reader and go to Administration tab
5. select user right tab

  
Actual results:
Note the preferred locale drop down is available. Also one can change it and save.

Expected results:

The list box shouldn't be available to read only user for any selection and  possibly hidden. These things should only be available when I am editing the "reader" user so that  I can my own preferences.