up.......

Is it throwing and exception or is your question more about how to actually set the locale for translation to take place? If you are please paste the exception and your controller code.

Try running in the command line "php artisan routes" this is often where I start with any route problem.

Try this

Route::group(array('prefix' => '{lang}'), function() {
    Route::get('users', 'UserController@showAll');
    Route::get('user/{id}', 'UserController@showProfile');
});

Well, thank you! I try this, but the language setting doesn't works.

Route::group(array('prefix' => '{lang}'), function() {
    App::setLocale($lang);
    Route::get('users', 'UserController@showAll');
    Route::get('user/{id}', 'UserController@showProfile');
});