Two different languages at the same time

[eluser]Unknown[/eluser]
I have shared content for all languages (same keywords, same values). So I'd like to keep this data in one place. For that I've created language called shared.

Now I'd like to load two lang_files from different languages:

Code:

$this->lang->load('interface', 'english');
$this->lang->load('interface', 'shared');

unfortunately it loads only english but not shared.

English and shared contains different keywords !