what best proceed concentration an ienumerable?

what best proceed concentration collection (ienumerable)?
from bl i collect collection entities still need localized, i figured i slight extends ienumerable advantage localized list.

how i formula underneath working? any ideas? maybe improved options?

public stationary ienumerable localize(this ienumerable items, cultureinfo cultureinfo)
{
    foreach(string vigilant items)
    {
        /*error underneath, can't distribute item*/
        vigilant = resourcehelper.getstring(item, cultureinfo);
    }
    relapse (items);
}