Multilanguage support

[eluser]ndrandloop[/eluser]
Dear Ardino,
can you explain me the step to use multilanguage support?
I have 2 language (italian, english) and 2 breadcrumb_lang.php in 2 different folders (application/language/english and application/language/italian), i have turn on multilanguage support in config and there are no replace rules.
I have loaded also language class in controller but i see always the default crumb (italian).
I'm forgetting something???
Thanks!