Multi-lingual interface in Drupal (without domain prefixes or suffixes)

My intention was to enable multi-lingual interface only for drupal built-in interface ("my account", "administration", nodes, commenting and so on) without any additional prefixes, which relies only on user language preferences. But it just doesn't work.

Fo开发者_JAVA技巧llowing this tutorial, I did this:

1. I installed 'internationalization', 'locate', 'translation' modules
2. I added the secondary language in settings
3. I have downloaded and put the translation files into drupal directory

It works when I use with prefix and does not work when with "None" setting.

Thanks for your help in advance.

It is unclear what do you want to do. If you want the multilingual system work without prefixes you should go to Home › Administer › Site configuration › Languages > Configure > Language negotiation and choose 'none' - the default language is used for site presentation, though users may (optionally) select a preferred language on the My Account page.