Remove languages from user's profile

It would be better to remove languages from user's profile and to use a cookie so that next time the user logs in, it sets the language he chose when signing up. Availability of setting languages causes some inconsistency.
For example:
If the language in profile is set to language 1, and the main page is set to language 2 or 3, it is expected that when user logs in, the language changes to one he chose in his profile. But it doesn't happen.

Steps to reproduce:
1. Go to http://uat.jtalks.org/jcommune/
2. Log in
3. go to profile settings
4. set the English language
5. apply settings
6. log out
7. change language of the site to Russian/Ukrainian
8. log in

Expected result: the language of the site is English
Actual result: the language of the site is Russian/Ukrainian